When setting restrictions on a Discount Coupon, you will see Top in the drop down ... Just set that to DENY so you will now see it in the Category section ...
If you have a customer referred by Dr. X and they make purchases with their Discount Coupon DrX20150129 then later come back with a purchase and use a Discount Coupon from Dr. Z for Discount Coupon DrZ20150201, do you want to still just know about Dr. X or do you now also want to know about Dr. Z?




