Call Activity completion condition

Hi ,
I have a call activity task in which I am calling sub workflows as per list items but I don’t want to wait for all sub-workflow completion state to proceed ahead. Is there any way to continue that sub-processes separately and proceed ahead on completion of required one’s
Can I proceed to the next task after call activity which includes more than 1 sub workflows?

e.g. In call activity, I am calling 3 sub workflows and in which 2 sub workflows are mandatory to proceed for the next task in parent workflow and one is optional. So I don’t want to wait for the optional sub-workflow (But I don’t want to discard optional one, It should be open for action), Once I am completed with required 2 then want to go ahead.