I had some auctions end today. When i combine the invoices and try to deduct $ for shipping discount it wont work. If the total shipping is $4 and I put in an amount as -2.00 at the bottom and hit "recalculate" it still shows the total being as $4. I sent invoices with instructions for the buyers to deduct it on their end when they check out since i couldnt. Will my buyers be able to deduct $ to reflect my shipping discounts?????