In reply to sruthikrapa:
Your requirements are still not clear. You can have one sequence execute to completion, then the next sequence execute to completion. When you want this to happen, you don’t start the sequences in parallel.
The other approach is to have sequence A send one sequence_item, then sequence B send one sequence_item, and then continue in some random pattern. In this case, you would have the sequences run in parallel.
Perhaps if you post code showing the actual sequences we can get a better understanding of what you are trying to accomplish. Your example shows three of the same sub-sequences, which doesn’t match what you are saying.