Step 1: To split your list, go to List> Tools.
Step 2: Click on Sync Subscribers.
Step 3:
- Select your primary list
- Select your secondary list
- Select the action you want to perform when the same subscriber from the primary list has a distinct status in the secondary list –
“Update subscriber in the primary list”, “Update subscriber in the secondary list” or “Delete subscriber from secondary list”. - Click on Sync to perform your action