Partner function for a team in Change Request Management

I have defined a new transaction type based on Urgent Correction. I have three partner functions:

Change Manager, Team Member and Quality Assurance Team. The first two partner functions are represented by single business partner so I can define them like employee. The third one should be represented by a team of persons, so that the Correction can be seen by every person belonging to this team in their worklist. How can I define a partner function like a team and how can I assign single business partner to the team. I would have something like this:

I have three business partners A(11),B(12),C(13) belonging to the QA team(20). When I put 20 in the QA team field, i want that the correction is in the worklist of A,B,C.

Thanks

Antonello