If I add multiple end events in a sub-process, will the process return back to the main process and continue when it hits either end event?
A sub-process ends when there are no more active nodes inside the sub-process.
So if there are multiple end events in sub-process, it would not return back to main process when one end event is reached but there are still running steps inside.
Are you wanting the process to start over if the entry goes down and hits ones of the end branches?
If there is an end activity then it is going to terminate the workflow for that entry, therefore the workflow will no longer act on the entry. Now if there is a "change" rule for the folder where the entry resides, then the workflow will pick it up again from the beginning once a user makes a change to the entry.
But we are talking about a sub-process, so I don't believe it terminates the workflow. I think you may be getting Workflow and Forms confused.
Ahh, so you are working with Forms. I wasn't clear on what you were working in.