I will combine shipping on multiple purchases since it allowsme to reduce shipping costs. Here is how I do that.  Once the buyerhas made their purchases and made payment, I will package the items andcalculate the shipping costs. Then, I will issue the buyer a refund for thedifference between my actual shipping costs and the shipping costs the buyerpaid as part of the purchase of items.  I process this refund at thesame time I am shipping the items.