Two steps: - create a new, empty, address group in the receiving addressbook - highlight the entries in the sending addressgroup and drag to the new addressgroup

That didn't work, but it helped. What did work was to select all the contacts within the group, then you get a screen that gives you an option to Write or to create a new list. I then created a new list where I wanted it, and deleted the old list. Thanks for your help, it got me to the end point.

Thanks for the feedback. I had just checked those steps to ensure they worked, but I'm glad you found a solution. I'll keep both in mind for the time I see the question. :)