Apply Coupon After Order Has Been Placed

I offer discounts to certain clients and give them coupons, more often than not they forget to enter the coupon, so then I have to edit the orders and manually correct the price.

I've noticed if you "Edit Order" there is a place for "discount" and "Discount Name" but this does not actually apply the coupon, this seems to be a manual input.

Is this the correct way to adding discounts after the fact or how do you actually Apply one?

Edited by

If you make any changes to the order like adding a coupon, you will have to redo the calculations on the order. It doesn't automatically do it.

Edited by

Ahh okay, thought so just wanted to make sure! Thanks Tim

Edited by