hi i would like to find out how i can use the “Discount %” button to take off a fixed amount from a total order.
for example if the total of my order is £102.50, i want to be able to enter 2.50 into number pad and then hit “discount” and once i do this i want it to deduct £2.50 from my total order.
It shows how to configure a calculation template that works with fixed amounts. So you need to configure related calculation template (or create new one) and set calculation type as Fixed Amount.
Also check this tutorial. It shows (method 4) how to add a button that calculates discounts from amounts. So instead of entering 5.32 you can enter 100 (target amount) to deduct 5.32 from 105.32
I wanted to show you how search feature works. There are lots of useful information.
PS: Round button located next to Discount % button also does what you want.