diff --git a/src/libs/modelinglib/qmt/diagram_controller/diagramcontroller.cpp b/src/libs/modelinglib/qmt/diagram_controller/diagramcontroller.cpp
index a794de55a76..00688013593 100644
--- a/src/libs/modelinglib/qmt/diagram_controller/diagramcontroller.cpp
+++ b/src/libs/modelinglib/qmt/diagram_controller/diagramcontroller.cpp
@@ -487,7 +487,7 @@ DContainer DiagramController::copyElements(const DSelection &diagramSelection, c
     return copiedElements;
 }
 
-void DiagramController::pasteElements(const DContainer &diagramContainer, MDiagram *diagram)
+void DiagramController::pasteElements(const DReferences &diagramContainer, MDiagram *diagram)
 {
     QMT_ASSERT(diagram, return);
 
diff --git a/src/libs/modelinglib/qmt/diagram_controller/diagramcontroller.h b/src/libs/modelinglib/qmt/diagram_controller/diagramcontroller.h
index aa09636e5e3..e84cec69209 100644
--- a/src/libs/modelinglib/qmt/diagram_controller/diagramcontroller.h
+++ b/src/libs/modelinglib/qmt/diagram_controller/diagramcontroller.h
@@ -120,7 +120,7 @@ public:
 
     DContainer cutElements(const DSelection &diagramSelection, MDiagram *diagram);
     DContainer copyElements(const DSelection &diagramSelection, const MDiagram *diagram);
-    void pasteElements(const DContainer &diagramContainer, MDiagram *diagram);
+    void pasteElements(const DReferences &diagramContainer, MDiagram *diagram);
     void deleteElements(const DSelection &diagramSelection, MDiagram *diagram);
 
 private:
diff --git a/src/libs/modelinglib/qmt/document_controller/documentcontroller.cpp b/src/libs/modelinglib/qmt/document_controller/documentcontroller.cpp
index 009e16d2d15..19db9ed5194 100644
--- a/src/libs/modelinglib/qmt/document_controller/documentcontroller.cpp
+++ b/src/libs/modelinglib/qmt/document_controller/documentcontroller.cpp
@@ -35,7 +35,6 @@
 #include "qmt/diagram_ui/diagramsmanager.h"
 #include "qmt/diagram_ui/sceneinspector.h"
 #include "qmt/model_controller/mcontainer.h"
-#include "qmt/model_controller/modelcontroller.h"
 #include "qmt/model_controller/mselection.h"
 #include "qmt/model/mcanvasdiagram.h"
 #include "qmt/model/mclass.h"
@@ -70,9 +69,7 @@ DocumentController::DocumentController(QObject *parent) :
     m_treeModel(new TreeModel(this)),
     m_sortedTreeModel(new SortedTreeModel(this)),
     m_diagramsManager(new DiagramsManager(this)),
-    m_sceneInspector(new SceneInspector(this)),
-    m_modelClipboard(new MContainer()),
-    m_diagramClipboard(new DContainer())
+    m_sceneInspector(new SceneInspector(this))
 {
     // project controller
     connect(m_projectController, &ProjectController::changed, this, &DocumentController::changed);
@@ -135,44 +132,30 @@ DocumentController::~DocumentController()
     delete m_projectController;
 }
 
-bool DocumentController::isModelClipboardEmpty() const
-{
-    return m_modelClipboard->isEmpty();
-}
-
-bool DocumentController::isDiagramClipboardEmpty() const
-{
-    return m_diagramClipboard->isEmpty();
-}
-
 bool DocumentController::hasDiagramSelection(const MDiagram *diagram) const
 {
     return m_diagramsManager->diagramSceneModel(diagram)->hasSelection();
 }
 
-void DocumentController::cutFromModel(const MSelection &selection)
+MContainer DocumentController::cutFromModel(const MSelection &selection)
 {
-    *m_modelClipboard = m_modelController->cutElements(selection);
-    emit modelClipboardChanged(isModelClipboardEmpty());
+    return m_modelController->cutElements(selection);
 }
 
-void DocumentController::cutFromDiagram(MDiagram *diagram)
+DContainer DocumentController::cutFromDiagram(MDiagram *diagram)
 {
-    *m_diagramClipboard = m_diagramController->cutElements(m_diagramsManager->diagramSceneModel(diagram)->selectedElements(), diagram);
-    emit diagramClipboardChanged(isDiagramClipboardEmpty());
+    return m_diagramController->cutElements(m_diagramsManager->diagramSceneModel(diagram)->selectedElements(), diagram);
 }
 
-void DocumentController::copyFromModel(const MSelection &selection)
+MContainer DocumentController::copyFromModel(const MSelection &selection)
 {
-    *m_modelClipboard = m_modelController->copyElements(selection);
-    emit modelClipboardChanged(isModelClipboardEmpty());
+    return m_modelController->copyElements(selection);
 }
 
-void DocumentController::copyFromDiagram(const qmt::MDiagram *diagram)
+DContainer DocumentController::copyFromDiagram(const qmt::MDiagram *diagram)
 {
     m_diagramsManager->diagramSceneModel(diagram)->copyToClipboard();
-    *m_diagramClipboard = m_diagramController->copyElements(m_diagramsManager->diagramSceneModel(diagram)->selectedElements(), diagram);
-    emit diagramClipboardChanged(isDiagramClipboardEmpty());
+    return m_diagramController->copyElements(m_diagramsManager->diagramSceneModel(diagram)->selectedElements(), diagram);
 }
 
 void DocumentController::copyDiagram(const MDiagram *diagram)
@@ -180,15 +163,15 @@ void DocumentController::copyDiagram(const MDiagram *diagram)
     m_diagramsManager->diagramSceneModel(diagram)->copyToClipboard();
 }
 
-void DocumentController::pasteIntoModel(MObject *modelObject)
+void DocumentController::pasteIntoModel(MObject *modelObject, const MReferences &container, ModelController::PasteOption option)
 {
     if (modelObject)
-        m_modelController->pasteElements(modelObject, *m_modelClipboard);
+        m_modelController->pasteElements(modelObject, container, option);
 }
 
-void DocumentController::pasteIntoDiagram(MDiagram *diagram)
+void DocumentController::pasteIntoDiagram(MDiagram *diagram, const DReferences &container)
 {
-    m_diagramController->pasteElements(*m_diagramClipboard, diagram);
+    m_diagramController->pasteElements(container, diagram);
 }
 
 void DocumentController::deleteFromModel(const MSelection &selection)
diff --git a/src/libs/modelinglib/qmt/document_controller/documentcontroller.h b/src/libs/modelinglib/qmt/document_controller/documentcontroller.h
index 6b4eea96760..e6e0f9dca6b 100644
--- a/src/libs/modelinglib/qmt/document_controller/documentcontroller.h
+++ b/src/libs/modelinglib/qmt/document_controller/documentcontroller.h
@@ -27,12 +27,12 @@
 
 #include <QObject>
 #include "qmt/infrastructure/qmt_global.h"
+#include "qmt/model_controller/modelcontroller.h"
 
 namespace qmt {
 
 class ProjectController;
 class UndoController;
-class ModelController;
 class DiagramController;
 class DiagramSceneController;
 class StyleController;
@@ -49,6 +49,7 @@ class MDiagram;
 class MCanvasDiagram;
 class MContainer;
 class DContainer;
+class DReferences;
 class MSelection;
 class MObject;
 
@@ -61,8 +62,6 @@ public:
 
 signals:
     void changed();
-    void modelClipboardChanged(bool isEmpty);
-    void diagramClipboardChanged(bool isEmpty);
 
 public:
     ProjectController *projectController() const { return m_projectController; }
@@ -78,17 +77,15 @@ public:
     DiagramsManager *diagramsManager() const { return m_diagramsManager; }
     SceneInspector *sceneInspector() const { return m_sceneInspector; }
 
-    bool isModelClipboardEmpty() const;
-    bool isDiagramClipboardEmpty() const;
     bool hasDiagramSelection(const qmt::MDiagram *diagram) const;
 
-    void cutFromModel(const MSelection &selection);
-    void cutFromDiagram(MDiagram *diagram);
-    void copyFromModel(const MSelection &selection);
-    void copyFromDiagram(const MDiagram *diagram);
+    MContainer cutFromModel(const MSelection &selection);
+    DContainer cutFromDiagram(MDiagram *diagram);
+    MContainer copyFromModel(const MSelection &selection);
+    DContainer copyFromDiagram(const MDiagram *diagram);
     void copyDiagram(const MDiagram *diagram);
-    void pasteIntoModel(MObject *modelObject);
-    void pasteIntoDiagram(MDiagram *diagram);
+    void pasteIntoModel(MObject *modelObject, const MReferences &container, ModelController::PasteOption option);
+    void pasteIntoDiagram(MDiagram *diagram, const DReferences &container);
     void deleteFromModel(const MSelection &selection);
     void deleteFromDiagram(MDiagram *diagram);
     void removeFromDiagram(MDiagram *diagram);
@@ -118,8 +115,6 @@ private:
     SortedTreeModel *m_sortedTreeModel = nullptr;
     DiagramsManager *m_diagramsManager = nullptr;
     SceneInspector *m_sceneInspector = nullptr;
-    QScopedPointer<MContainer> m_modelClipboard;
-    QScopedPointer<DContainer> m_diagramClipboard;
 };
 
 } // namespace qmt
diff --git a/src/libs/modelinglib/qmt/model_controller/modelcontroller.cpp b/src/libs/modelinglib/qmt/model_controller/modelcontroller.cpp
index fc3072da27f..ff74d61ff33 100644
--- a/src/libs/modelinglib/qmt/model_controller/modelcontroller.cpp
+++ b/src/libs/modelinglib/qmt/model_controller/modelcontroller.cpp
@@ -604,16 +604,24 @@ void ModelController::setUndoController(UndoController *undoController)
     m_undoController = undoController;
 }
 
+Uid ModelController::ownerKey(const Uid &key) const
+{
+    MElement *element = findElement(key);
+    if (!element)
+        return Uid::invalidUid();
+    return ownerKey(element);
+}
+
 Uid ModelController::ownerKey(const MElement *element) const
 {
     QMT_ASSERT(element, return Uid());
     MObject *owner = element->owner();
     if (!owner)
-        return Uid();
+        return Uid::invalidUid();
     return owner->uid();
 }
 
-MElement *ModelController::findElement(const Uid &key)
+MElement *ModelController::findElement(const Uid &key) const
 {
     if (MObject *object = findObject(key))
         return object;
@@ -915,17 +923,20 @@ MContainer ModelController::copyElements(const MSelection &modelSelection)
     return copiedElements;
 }
 
-void ModelController::pasteElements(MObject *owner, const MContainer &modelContainer)
+void ModelController::pasteElements(MObject *owner, const MReferences &modelContainer, PasteOption option)
 {
     // clone all elements and renew their keys
     QHash<Uid, Uid> renewedKeys;
     QList<MElement *> clonedElements;
     foreach (MElement *element, modelContainer.elements()) {
-        MCloneDeepVisitor visitor;
-        element->accept(&visitor);
-        MElement *clonedElement = visitor.cloned();
-        renewElementKey(clonedElement, &renewedKeys);
-        clonedElements.append(clonedElement);
+        if (option == PasteAlwaysWithNewKeys || option == PasteAlwaysAndKeepKeys || !findElement(element->uid())) {
+            MCloneDeepVisitor visitor;
+            element->accept(&visitor);
+            MElement *clonedElement = visitor.cloned();
+            if (option == PasteAlwaysWithNewKeys || (option == PasteAlwaysAndKeepKeys && findElement(element->uid())))
+                renewElementKey(clonedElement, &renewedKeys);
+            clonedElements.append(clonedElement);
+        }
     }
     // fix all keys referencing between pasting elements
     foreach (MElement *clonedElement, clonedElements)
diff --git a/src/libs/modelinglib/qmt/model_controller/modelcontroller.h b/src/libs/modelinglib/qmt/model_controller/modelcontroller.h
index 345d5c0ce98..5b95d2a575b 100644
--- a/src/libs/modelinglib/qmt/model_controller/modelcontroller.h
+++ b/src/libs/modelinglib/qmt/model_controller/modelcontroller.h
@@ -61,6 +61,13 @@ class QMT_EXPORT ModelController : public QObject
     class MoveRelationCommand;
 
 public:
+
+    enum PasteOption {
+        PasteAlwaysWithNewKeys,
+        PasteAlwaysAndKeepKeys,
+        PasteOnlyNewElements
+    };
+
     explicit ModelController(QObject *parent = nullptr);
     ~ModelController() override;
 
@@ -93,8 +100,9 @@ public:
     UndoController *undoController() const { return m_undoController; }
     void setUndoController(UndoController *undoController);
 
+    Uid ownerKey(const Uid &key) const;
     Uid ownerKey(const MElement *element) const;
-    MElement *findElement(const Uid &key);
+    MElement *findElement(const Uid &key) const;
     template<class T>
     T *findElement(const Uid &key) { return dynamic_cast<T *>(findElement(key)); }
 
@@ -124,7 +132,7 @@ public:
 
     MContainer cutElements(const MSelection &modelSelection);
     MContainer copyElements(const MSelection &modelSelection);
-    void pasteElements(MObject *owner, const MContainer &modelContainer);
+    void pasteElements(MObject *owner, const MReferences &modelContainer, PasteOption option);
     void deleteElements(const MSelection &modelSelection);
 
 private:
diff --git a/src/plugins/modeleditor/modeleditor.cpp b/src/plugins/modeleditor/modeleditor.cpp
index dba9416a4a9..6af7b79e3c3 100644
--- a/src/plugins/modeleditor/modeleditor.cpp
+++ b/src/plugins/modeleditor/modeleditor.cpp
@@ -42,6 +42,8 @@
 #include "qmt/controller/undocontroller.h"
 #include "qmt/diagram/dpackage.h"
 #include "qmt/diagram_controller/diagramcontroller.h"
+#include "qmt/diagram_controller/dcontainer.h"
+#include "qmt/diagram_controller/dreferences.h"
 #include "qmt/diagram_controller/dselection.h"
 #include "qmt/diagram_scene/diagramscenemodel.h"
 #include "qmt/diagram_ui/diagram_mime_types.h"
@@ -51,6 +53,8 @@
 #include "qmt/model/mcomponent.h"
 #include "qmt/model/mcanvasdiagram.h"
 #include "qmt/model_controller/modelcontroller.h"
+#include "qmt/model_controller/mcontainer.h"
+#include "qmt/model_controller/mreferences.h"
 #include "qmt/model_controller/mselection.h"
 #include "qmt/model_ui/treemodel.h"
 #include "qmt/model_ui/treemodelmanager.h"
@@ -390,7 +394,7 @@ void ModelEditor::initDocument()
 
     d->modelTreeViewServant->setTreeModel(documentController->treeModel());
 
-    connect(documentController, &qmt::DocumentController::diagramClipboardChanged,
+    connect(ModelEditorPlugin::modelsManager(), &ModelsManager::diagramClipboardChanged,
             this, &ModelEditor::onDiagramClipboardChanged, Qt::QueuedConnection);
     connect(documentController->undoController()->undoStack(), &QUndoStack::canUndoChanged,
             this, &ModelEditor::onCanUndoChanged, Qt::QueuedConnection);
@@ -459,15 +463,16 @@ void ModelEditor::redo()
 void ModelEditor::cut()
 {
     ExtDocumentController *documentController = d->document->documentController();
+    ModelsManager *modelsManager = ModelEditorPlugin::modelsManager();
 
     switch (d->selectedArea) {
     case SelectedArea::Nothing:
         break;
     case SelectedArea::Diagram:
-        documentController->cutFromDiagram(currentDiagram());
+        setDiagramClipboard(documentController->cutFromDiagram(currentDiagram()));
         break;
     case SelectedArea::TreeView:
-        documentController->cutFromModel(d->modelTreeViewServant->selectedObjects());
+        modelsManager->setModelClipboard(documentController, documentController->cutFromModel(d->modelTreeViewServant->selectedObjects()));
         break;
     }
 }
@@ -475,18 +480,19 @@ void ModelEditor::cut()
 void ModelEditor::copy()
 {
     ExtDocumentController *documentController = d->document->documentController();
+    ModelsManager *modelsManager = ModelEditorPlugin::modelsManager();
 
     switch (d->selectedArea) {
     case SelectedArea::Nothing:
         break;
     case SelectedArea::Diagram:
         if (documentController->hasDiagramSelection(currentDiagram()))
-            documentController->copyFromDiagram(currentDiagram());
+            setDiagramClipboard(documentController->copyFromDiagram(currentDiagram()));
         else
             documentController->copyDiagram(currentDiagram());
         break;
     case SelectedArea::TreeView:
-        documentController->copyFromModel(d->modelTreeViewServant->selectedObjects());
+        modelsManager->setModelClipboard(documentController, documentController->copyFromModel(d->modelTreeViewServant->selectedObjects()));
         break;
     }
 }
@@ -494,15 +500,20 @@ void ModelEditor::copy()
 void ModelEditor::paste()
 {
     ExtDocumentController *documentController = d->document->documentController();
+    ModelsManager *modelsManager = ModelEditorPlugin::modelsManager();
 
     switch (d->selectedArea) {
     case SelectedArea::Nothing:
         break;
     case SelectedArea::Diagram:
-        documentController->pasteIntoDiagram(currentDiagram());
+        // on cut/copy diagram and model elements were copied.
+        documentController->pasteIntoModel(currentDiagram(), modelsManager->modelClipboard(), qmt::ModelController::PasteOnlyNewElements);
+        documentController->pasteIntoDiagram(currentDiagram(), modelsManager->diagramClipboard());
         break;
     case SelectedArea::TreeView:
-        documentController->pasteIntoModel(d->modelTreeViewServant->selectedObject());
+        documentController->pasteIntoModel(d->modelTreeViewServant->selectedObject(), modelsManager->modelClipboard(),
+                                           documentController == modelsManager->modelClipboardDocumentController()
+                                           ? qmt::ModelController::PasteAlwaysWithNewKeys : qmt::ModelController::PasteAlwaysAndKeepKeys);
         break;
     }
 }
@@ -656,6 +667,7 @@ void ModelEditor::updateSelectedArea(SelectedArea selectedArea)
     d->selectedArea = selectedArea;
 
     qmt::DocumentController *documentController = d->document->documentController();
+    ModelsManager *modelsManager = ModelEditorPlugin::modelsManager();
     bool canCutCopyDelete = false;
     bool canRemove = false;
     bool canPaste = false;
@@ -680,7 +692,7 @@ void ModelEditor::updateSelectedArea(SelectedArea selectedArea)
             bool hasSelection = documentController->diagramsManager()->diagramSceneModel(activeDiagram)->hasSelection();
             canCutCopyDelete = hasSelection;
             canRemove = hasSelection;
-            canPaste = !documentController->isDiagramClipboardEmpty();
+            canPaste = !modelsManager->isDiagramClipboardEmpty();
             canSelectAll = !activeDiagram->diagramElements().isEmpty();
             canCopyDiagram = !hasSelection;
             canExportDiagram = true;
@@ -705,7 +717,7 @@ void ModelEditor::updateSelectedArea(SelectedArea selectedArea)
         bool hasSelection = !d->modelTreeViewServant->selectedObjects().isEmpty();
         bool hasSingleSelection = d->modelTreeViewServant->selectedObjects().indices().size() == 1;
         canCutCopyDelete = hasSelection && !d->modelTreeViewServant->isRootPackageSelected();
-        canPaste =  hasSingleSelection && !documentController->isModelClipboardEmpty();
+        canPaste =  hasSingleSelection && !modelsManager->isModelClipboardEmpty();
         canSelectAll = activeDiagram && !activeDiagram->diagramElements().isEmpty();
         canExportDiagram = activeDiagram != nullptr;
         QModelIndexList indexes = d->modelTreeView->selectedSourceModelIndexes();
@@ -1224,6 +1236,20 @@ void ModelEditor::onContentSet()
     expandModelTreeToDepth(0);
 }
 
+void ModelEditor::setDiagramClipboard(const qmt::DContainer &dcontainer)
+{
+    ExtDocumentController *documentController = d->document->documentController();
+    qmt::ModelController *modelController = documentController->modelController();
+    qmt::MSelection modelSelection;
+    for (const auto &delement : dcontainer.elements()) {
+        qmt::Uid melementUid = delement->modelUid();
+        qmt::Uid mownerUid = modelController->ownerKey(melementUid);
+        modelSelection.append(melementUid, mownerUid);
+    }
+    qmt::MContainer mcontainer = modelController->copyElements(modelSelection);
+    ModelEditorPlugin::modelsManager()->setDiagramClipboard(documentController, dcontainer, mcontainer);
+}
+
 void ModelEditor::addDiagramToSelector(const qmt::MDiagram *diagram)
 {
     QString diagramLabel = buildDiagramLabel(diagram);
diff --git a/src/plugins/modeleditor/modeleditor.h b/src/plugins/modeleditor/modeleditor.h
index 3fdeb8d1d9c..ed7eed431f7 100644
--- a/src/plugins/modeleditor/modeleditor.h
+++ b/src/plugins/modeleditor/modeleditor.h
@@ -41,6 +41,7 @@ class MElement;
 class MPackage;
 class MDiagram;
 class DElement;
+class DContainer;
 class DocumentController;
 }
 
@@ -140,6 +141,8 @@ private:
 
     void onContentSet();
 
+    void setDiagramClipboard(const qmt::DContainer &dcontainer);
+
     void addDiagramToSelector(const qmt::MDiagram *diagram);
     void updateDiagramSelector();
     void onDiagramSelectorSelected(int index);
diff --git a/src/plugins/modeleditor/modelsmanager.cpp b/src/plugins/modeleditor/modelsmanager.cpp
index 89d691ddc6e..683006817de 100644
--- a/src/plugins/modeleditor/modelsmanager.cpp
+++ b/src/plugins/modeleditor/modelsmanager.cpp
@@ -34,10 +34,14 @@
 #include "pxnodecontroller.h"
 
 #include "qmt/config/configcontroller.h"
+#include "qmt/diagram_controller/dcontainer.h"
+#include "qmt/diagram_controller/dreferences.h"
 #include "qmt/diagram_scene/diagramscenemodel.h"
 #include "qmt/diagram_ui/diagramsmanager.h"
 #include "qmt/model/mdiagram.h"
 #include "qmt/model_controller/modelcontroller.h"
+#include "qmt/model_controller/mcontainer.h"
+#include "qmt/model_controller/mreferences.h"
 #include "qmt/project_controller/projectcontroller.h"
 #include "qmt/project/project.h"
 #include "qmt/stereotype/stereotypecontroller.h"
@@ -91,6 +95,11 @@ public:
     ModelIndexer *modelIndexer = nullptr;
     QList<Core::IDocument *> documentsToBeClosed;
 
+    ExtDocumentController *modelClipboardDocumentController = nullptr;
+    qmt::MContainer modelClipboard;
+    ExtDocumentController *diagramClipboardDocumentController = nullptr;
+    qmt::DContainer diagramClipboard;
+
     QAction *openDiagramContextMenuItem = nullptr;
     ProjectExplorer::Node *contextMenuOwnerNode = nullptr;
 };
@@ -142,6 +151,10 @@ ExtDocumentController *ModelsManager::createModel(ModelDocument *modelDocument)
 
 void ModelsManager::releaseModel(ExtDocumentController *documentController)
 {
+    if (documentController == d->modelClipboardDocumentController)
+        d->modelClipboardDocumentController = nullptr;
+    if (documentController == d->diagramClipboardDocumentController)
+        d->diagramClipboardDocumentController = nullptr;
     for (int i = 0; i < d->managedModels.size(); ++i) {
         ManagedModel *managedModel = &d->managedModels[i];
         if (managedModel->m_documentController == documentController) {
@@ -165,6 +178,55 @@ void ModelsManager::openDiagram(const qmt::Uid &modelUid, const qmt::Uid &diagra
     }
 }
 
+bool ModelsManager::isModelClipboardEmpty() const
+{
+    return d->modelClipboard.isEmpty();
+}
+
+ExtDocumentController *ModelsManager::modelClipboardDocumentController() const
+{
+    return d->modelClipboardDocumentController;
+}
+
+qmt::MReferences ModelsManager::modelClipboard() const
+{
+    qmt::MReferences clipboard;
+    clipboard.setElements(d->modelClipboard.elements());
+    return clipboard;
+}
+
+void ModelsManager::setModelClipboard(ExtDocumentController *documentController, const qmt::MContainer &container)
+{
+    d->modelClipboardDocumentController = documentController;
+    d->modelClipboard = container;
+    emit modelClipboardChanged(isModelClipboardEmpty());
+}
+
+bool ModelsManager::isDiagramClipboardEmpty() const
+{
+    return d->diagramClipboard.isEmpty();
+}
+
+ExtDocumentController *ModelsManager::diagramClipboardDocumentController() const
+{
+    return d->diagramClipboardDocumentController;
+}
+
+qmt::DReferences ModelsManager::diagramClipboard() const
+{
+    qmt::DReferences clipboard;
+    clipboard.setElements(d->diagramClipboard.elements());
+    return clipboard;
+}
+
+void ModelsManager::setDiagramClipboard(ExtDocumentController *documentController, const qmt::DContainer &dcontainer, const qmt::MContainer &mcontainer)
+{
+    setModelClipboard(documentController, mcontainer);
+    d->diagramClipboardDocumentController = documentController;
+    d->diagramClipboard = dcontainer;
+    emit diagramClipboardChanged(isDiagramClipboardEmpty());
+}
+
 void ModelsManager::onAboutToShowContextMenu(ProjectExplorer::Project *project,
                                              ProjectExplorer::Node *node)
 {
diff --git a/src/plugins/modeleditor/modelsmanager.h b/src/plugins/modeleditor/modelsmanager.h
index 09b1e290551..71972203503 100644
--- a/src/plugins/modeleditor/modelsmanager.h
+++ b/src/plugins/modeleditor/modelsmanager.h
@@ -36,6 +36,10 @@ namespace qmt {
 class Uid;
 class MDiagram;
 class DiagramsViewInterface;
+class MContainer;
+class MReferences;
+class DContainer;
+class DReferences;
 }
 
 namespace ModelEditor {
@@ -56,10 +60,26 @@ public:
     explicit ModelsManager(QObject *parent = nullptr);
     ~ModelsManager();
 
+signals:
+    void modelClipboardChanged(bool isEmpty);
+    void diagramClipboardChanged(bool isEmpty);
+
+public:
     ExtDocumentController *createModel(ModelDocument *modelDocument);
     void releaseModel(ExtDocumentController *documentController);
     void openDiagram(const qmt::Uid &modelUid, const qmt::Uid &diagramUid);
 
+    bool isModelClipboardEmpty() const;
+    ExtDocumentController *modelClipboardDocumentController() const;
+    qmt::MReferences modelClipboard() const;
+    void setModelClipboard(ExtDocumentController *documentController, const qmt::MContainer &container);
+
+    bool isDiagramClipboardEmpty() const;
+    ExtDocumentController *diagramClipboardDocumentController() const;
+    qmt::DReferences diagramClipboard() const;
+    void setDiagramClipboard(ExtDocumentController *documentController, const qmt::DContainer &dcontainer,
+                             const qmt::MContainer &mcontainer);
+
 private:
     void onAboutToShowContextMenu(ProjectExplorer::Project *project, ProjectExplorer::Node *node);
     void onOpenDiagramFromProjectExplorer();