Ok, I'm going to resurect this one. Basically the same thing that the first poster said...

I want to do a site for a fundraising company and upon checkout they could enter a fundraising code (much the way the coupon code works). I think what would be best is if there would be a drop-down of charities and then they enter their pin. If it matches then they can checkout and it will show, for example 50% going to that charity and the sale's persons name. Also we'd want it to show on the invoice.