Understanding PRM

We want to reflect the following situation in CRMoD.

Imagine we have a Partner namely “Partner A”. This partner works with three companies namely “Company A”, “Company B” and “Company C”.

This partner send us information about the opportunities they have with “Company A”, “Company B” and “Company C”.

So, we create the Opportunities in CRMoD linked to “Company A”, “Company B” and “Company C”.  Is this correct??

But we also need to know, what is the business we have with “Partner A”. This is something like if we ask CRMoD about “Partner A”, we should see the opportunities created with “Company A”, “Company B” and “Company C”.