how to give a discount on an invoice for multiply buys

[7goldie7]

I offered a 20% discount if a buyer bought the 3 items. How do you change the price on an invoice to reflect this discount. It is only allowing me to remove the postage.

Thanks 

Gill

[tobiasd4]

If you are offering discount like that, you are obviously a business, buying to sell makes you one.

Upgrade now before you get suspended.

Business seller policy | eBay

[pixiesen2012]

to offer a discount like that you have to use ebays official multibuy option when creating the listing

you can't discount the item price after a sale, you can only reduce the P&P