How do I create a separate Address Book? I'm not asking about a mailing list but an address book where the addresses are not mixed in with my regular address b

How do I create a separate Address Book? I'm not asking about a mailing list but an address book where the addresses are not mixed in with my regular address book. I already have three address books created for me by Thunderbird. I add all new addresses to one of those but am afraid to delete the other address books because some of their addresses are not repeated in my "main" address book. So if I don't delete all the names in one of the existing books, I need to create an empty book that will not mix the addresses with those in another address book. HOW DO I CREATE A NEW, EMPTY ADDRESS BOOK? I want to be able to create various mailing LISTS using the addresses in this new book so I will eventually have a special address book with a variety of mailing lists I can use as I wish.