Marketpress and fees per order

Hello,

Sorry for my very very bad english, but I will try to explain the best than I can my request.
In fact, I would like to setup a multiusers online shop with a global paypal account that can generate fees (automatically).

ie ... an order is paid by a client and marketpress generate x % for the main account and x % for specificuser account ...with no manual intervention. Is it possible ?

thanks a lot for your help

Fulgence