A contact can belong to more than one list at once â lists are overlapping groups, not exclusive buckets. Adding a contact to a new list doesn't remove them from the original, duplicate their record, or affect their tags, sequences, or history.
đ Steps
Go to Contacts and open the List dropdown (top-left).
Select the source list.
Select the contacts you want to add (or select all).
Click Add to List and choose the destination list, or create a new one.
Confirm. The contacts are now part of both lists.
đ Deleting a list never deletes the contacts inside it â the default "All" list always contains every contact.