I added new address book under default Contacts.
I added new Contact Group and give it a name.
On the right hand side box "Add Members to this Group" you should be able
to select the new address book I just created and select the email addresses you want.
It does not show up in the drop down list.
It only shows default: Contacts, Personal and Shared, and Global address list
Unless I am missing something could be another issue with software.