MARKETPRESS - assign affiliate/user/member to a product on a WP single install

Basically what I want is to give predefined percentage of every sale to an affiliate, user or member for specific product. So every time that specific product sells, that affiliate, user or member will get the same amount of money. I know that MarketPress has this as in-built function for child sites where you could set percentage which you will collect from every store that is operating in your network. This is similar and the only difference is to split payments between admin and site members and not Network Admin and subSite Admins, as described above. Can it be done? If so, could provide full info on how to achieve this. If not, could you please propose solution that is somehow close to this idea?

Thanks in advance!