You can move contacts from one address book to another. The easiest way is to drag and drop contacts, but you can also right click a contact and choose Move.
- Open Address Book A and select the contacts you want to move to Address Book B by checking the box next to each name.
- Right-click one of the highlighted names and select Move from the menue.
- Now you will see a box there you select your destination Address Book > OK.
You can do the same with Contact Groups.