Pricing Rules

Does anyone know if there is a pricing rule (or other method) that will allow me to sell one product at full price then discount any other items added to the cart?  My catch is that all the items are from the same pool of performances.  We are going to be selling our camp offerings (summer camp, PA Day programs , ect...) through TNEW and we currently have an offer that says: buy one at full price and get 10% off any additional camp/program sold in the same order.  Any help, thoughts, insight, ect... would be greatly appreciated!  Thanks!