I would like to be able to subtotal lines within an invoice, and apply a discount ($dollar amount OR percentage) to that subtotal or individual line items.
e.g. I may have one invoice where I want to discount one category of work on the invoice, but not another. And I may want to take off a dollar amount, not a percentage.
Right now my workaround is to add a line item with a negative dollar amount. But my accountant said that's not going to be tracked correctly. (I don't know if that's true or not.)