Manage commission from agent

Hi all,

I have a problem. Please see the following scenario:

- The agent (A) ships goods to customers (B), but A can not issue service invoice to B.

- A delegates another company (C) to issue invoice to B.

- C will issue invoice to B and receive commission from A.

- A will pay commission for C.

The quesion is how C use SAP to:

- Issue invoices to B.

- Collect commission value extracted from invoices amount (%).

- Issue invoices to A based on commission value.

Does anyone know the way SAP solve this scenario. Please help me!

Thanks,

Moon