Commission to the Forwarding agent

Hello All,

I have a client requirment that they have 28 forwarding agents across the country which they treat as storage loction for storing the product only and they book the sales order on behalf of the stockists to the client directly, the ownership of stock will be with client untill it reaches to stockiest.

Client has to give them a commission on the basis of what number of sales have been done from this storage location.

Please suggest If I map this forwarding agents as storage locations in sap. then how will I provide commision to the storage locations.

Regards

Venkat