Pricing rule is your friend
(search on awesome bar)
You can set a lot of different behaviors: apply to customer, customer group, etc … mixed conditions, qty and amount minimums, discounts on percentage or amount, based on margin …
Depending on your print settings, discount will be shown.
Hope this helps.
I tried the pricing rule and associated it with a coupon code. When applying the code, the price
is changed directly, so the amounts in “%discount” and “discount amount” are zero.
Can you elaborate on how to show the coupon code or pricing rule discount on the sales order and/or Invoice?