Question
Coupons should be able to be applied to multiple products but the way it is now, you can only apply the coupon to all products or one product.  I need to apply a coupon to multiple products but not all.  
 
 
Answer:
The cart supports applying coupons to one product, all products or multiple products.  In the product setup screen there is a checkbox titled “Exclude Coupons”.  If you setup a coupon for all products then check exclude coupons for the products that you don’t want the coupon to apply to it will allow you to apply a coupon to multiple products but not all.