Duplicating a promo list is easy. Just complete the following steps -
1. Select "Promotion -> Promo Lists" on the top menu
2. Select the "Promo List" you wish to copy from the list
3. Click the "Copy" button from the icon menu
4. Enter the "New Promo List Name"
5. Click the "Copy" button
Your promo list has now been copied and the screen will display the brand new promo list with the name you specified.