Go To  ADMIN – SALES – COUPONS

To make a duplicate of an existing coupon code, use the buttons at the top/right of the screen.  First, select the Coupon Code you want to Copy, then click the COPY button.  The new code will have a “-1” at the end so that it is unique.

–  You can change the Coupon Name to whatever you want by clicking the EDIT button next to the code.
–  Make sure you update the Start & End dates, especially if you’ve copied an expired coupon code.