If you would like a discount to also discount modifiers you will need to turn on the option Include Modifiers. The Discount is applied to the item as well as its modifiers. For example, If a Cheeseburger is ordered for $5.95 and modified with Bacon for $0.50, the Discount is applied to the Cheeseburger and Bacon for a total of $6.45.
To turn this on:
- Go to Setup -> Order Type -> Discounts
- Choose desired Discount you want to edit.
- Turn on the Include Modifiers Option