Yes, can can delete contact(s) which is part of list. Follow these steps
Navigate to the Contacts section and click on the desired list name where you want to delete a contact.
Select the number(s) you want to remove.
Click Delete.
The selected contacts will be permanently deleted from the list.
If a contact exists in multiple lists, does deleting it from one list remove it from all?
No, deleting a contact from one list only removes it from that specific list. It will remain in any other lists where it was added.