master detail

Create a Process and create Subprocess from the list with "Call Activity" and "iteration" (multi-instantiation parallel)

Dear, it is difficult for me to be able to model a process of the type father and son or master detail with the use of the call to the Activity.

So far I have only modeled a single process in a simple way. I have not even needed to send messages, which I'm sure I'm wasting a lot of power.