I am looking for is there a way to associate a single Change Package with multiple Change Requests in integrity.
I dont know your Use Case but from release and config management standpoint its not good to link one change pack to multiple CRs.
When you create a CP, you need to associate with a CR, lets say CR 2020. The corresponding CP will then get 2020:1. One more CP will get 2020:2 etc.
A CR acts as reference why this change has to be handled. If you close the CR, no further CP can be added.
Reporting goes always from CP to the CR.
Saying this, you can have multiple CP associated with one CR, but not in the reverse.
Hope this clarifies.