You can create additional personal address books below My address books.
How to create a new personal address book:
Click the Folder-specific actions icon next to My address books in the folder view. Click on Add new address book.
Enter a name. In case the new address book should be a public address book, enable Add as public folder. Click on Add.
User interface:
The Address Book folder view
Related topics:
Subscribing to external address books
Moving or copying contacts
Managing Data with Folders
What are folder types?
Parent topic: Adding Address Books