Hi Tena.

If you R using multiple assignments there's 2 choices.

You can send 1 set of instances for all assignments, so for each subject a manager instance will be sent to all the subject's managers (so they'll see each others responses, or certainly responses will be collected together). Or, you can send separate sets of instances per JA.  In this case the subject with get sent many activities each one with only that manager on it.

Notifications.  Up till v17 Perform's notifications are entirely independent.  At v17 we deliver them using the centralised notifications system (which is allot better, you get much more control over them and can create your own easily).

If you want to I'm happy to get on a call with you to discuss your requirements and ideas I have to solve them.

Thanks