Follow the steps below to copy contacts from one list to another:
1. Sign-in to the dashboard
2. Click on the Manage Subscribers
3. Select the source list (from where you want to copy the contacts)
4. Click on Contacts drop-down button; it will open up a menu.
5. Click on Copy Contacts option
6. On the Copy Subscribers screen select the target list (To which you want to copy contacts)
7. Click on the Copy Contacts button