- Click on My Orders button to connect to SF Cloud interface

- Click Marketing -> Vouchers/Coupons

- Click -> Manage Vouchers button

- Click All dropdown and select “Reward Voucher” to view existing reward vouchers

- Tick the checkbox besides the Voucher ID and in the "Select an action" dropdown menu, choose "Disable"

- At the “Review existing Vouchers” page – Show Reward vouchers to view the list

- Click on the Voucher ID of the reward voucher

- Tick the individual Reward Voucher Codes and then click Delete button, see screenshot: