Cutting, Copying, and Pasting on Diagrams

You can cut, copy and paste diagram elements through the clipboard. Each time you send something to the clipboard its current contents are overwritten. A diagram element on the clipboard can be pasted into the diagram from which it originated or into another one.

To copy an element from a diagram and paste it into the same diagram:

Select the diagram element, then choose C opy on the context menu, or choose the Copy icon on the JDeveloper toolbar, or press Ctrl-C.
Place the pointer where you want the diagram element to be added, then choose Paste-Duplicate from the context menu.

To copy an element from a diagram and paste it into another diagram:

Select the diagram element, then choose C opy on the context menu, or choose the Copy icon on the JDeveloper toolbar, or press Ctrl-C.
Open the destination diagram.
Place the pointer where you want the diagram element to be added, then choose Paste from the context menu (or choose the Paste icon on the JDeveloper toolbar, or press Ctrl-V).
If you want to add another copy of the same element to the destination diagram, choose Paste-Duplicate from the context menu.