While there is currently a hack method to apply discounts (https://invoiceasap.zendesk.com/entries/21943991-How-do-I-apply-a-Discount-) it is quite cumbersome if a business needs more flexibility when giving discounts.
Ex. We have different discounts applied to the same product depending on the circumstance, we would like to create overall discounts applied to the whole invoice (ex. 10% loyalty discount), 100% discount for donations while still tracking the sale with an invoice.
It would be more useful to have a sub-button that allows you to apply a dollar or percent discount to an item, or a dollar or percent discount to an entire invoice purchase (lots of point-of-sale software has this functionality ex.ShopKeep).
Cheers!