When playing around with invoice plane i have seen there’s no feature for discounting things.
However i noticed when I add a new row to an invoice and type in -20% as price value it’ll reduce the price accordingly. Is discount intended to be added like that? ( as the % sign disappears after saving )
On a second try ( at least for quotes ) i noticed that calculating in percent does not work. however generally putting a negative number does. If there’s a feature for it in 1.4 we’ll see later that day.