Merging diagrams is sometimes required to bring useful information of different diagrams together into a single view.
In case you want to transfer the content from one Diagram to another one perform the steps below:
A – Goto DIAGRAM > Edit Diagram
B – Copy the XML code from the source diagram
C – Open the target diagram and repeat step A. Select Add to Existing Drawing in the target diagram and paste the clipboard content into field B. The content from the source model is added to the target model.
While the new content is all selected, move it to another area to avoid overlaps. Or you can move the content directly to another layer.
Alternatively you can export the diagram as XML and reimport it by dragging it to the target diagram.