Adding a coupon to a transaction that has to be minimum $100.00. The coupon will be $20.00 and it has to only include N/A Bev. and Food.
Sign into MC- SETUP- REDUCTIONS- COUPON
Set the coupon name as preferred.
Max amount will be $20.00 - You will want this to be the maximum amount you can discount.
Min Check: The check has to be at least $100.00 in order for the coupon to show up as an option.
Check mark
"Percentage Of Selection."

This is so when you go to rates, it will count 100% of the category towards the max amount of the coupon.
The items needed to be discounted should be selected. You can do "select all" at the bottom of the screen.
The example below is what it should look like. We should only have coupon be applied to food and N/A Bev. Therefor, since there is only 1 food item in the transaction, it should only discount $12.00 out of $20.00 being the max. The coupon works since the transaction is more than $100.00.