The final two sections on the Event Details Section give a quick report on the Promo Codes and the Voucher Codes that have been used during check out.
The Promo Codes column lists the names of the promo codes that have been created. The Discount column reports the % or discount associated with the code. The Total Discounts column lists the discounted total off the codes used. The Orders Used column lists the number of times that code has been used. Basic but important information!
Voucher Codes column lists the Voucher Codes created. Discount column list the amount of the discount and the Voucher Codes Used column lists the number of codes used vs the total available.