EA diagram deep copy

[Leszekd]

I work with BPMN 1.0 process diagrams in EA 7.5.843
 My issue is as follows.
I put the business process on a diagram A, then I removed its nested diagram.
In the browser, I moved another diagram (say, diagram B) to the process. Then, when I click on the process in the diagram, I expect that EA will open the diagram B, but it doesn't. When I click on the process with automatically created diagram, it does open it.
The same happens, when I add a new diagram to the process via "Add->add diagram" option in the browser pop-up menu.
What can I do to obtain the same behavior in these cases?
Please for an advice

[Geert Bellekens]

Try the "Advanced/Make Composite" option after moving the diagram under the activity.
This option takes the first nested diagram it finds and makes that the diagram that is opened when doubleclicking.

Geert

[Leszekd]

Great! It works! Thanks a lot!
PS It was a bit hard, because "Composite" option was already set. I had to switch it off, and then set it again.