How do I generate an invoice for combined shipping items after the buyer has already paid?

[disneyshopper]

You cannot create an invoice after the buyer has paid.  If you print a shipping label for combined shipping, you can do the following:  Go to

Seller Hub > Orders >Paid & shipped

Locate the transaction, click the down-arrow, click Send refund, select a reason (discount for combined shipping), enter the amount to be refunded, send.