Oh man, this is way over my head! 

Thank you for all your help! Are you able to tell me where I can locate the "discount line item" that you previously mentioned?

Is that the same as a "Custom Cart Discount"? I don't see "discount line item" listed.

Added note, these are for an in store POS system.

We are a collective store and I want to be able to offer discounts from the store, but when I do an order discount the discount gets evenly split between all of the products (and product vendors). Is there a way for the discount to come off the order...