Follow the steps below to copy contacts from one list to another:
1. Login to the dashboard
2. Click on the Subscribers tab then under Manage Subscribers choose the source contact list you want to copy.
3. Click on Contacts drop-down button; it will open up a menu then choose Copy Contacts to Another list.
4. On the Copy Subscribers screen select the target list (To which you want to copy contacts)
5.. Click on the Copy Subscribers button