Assigning Multiple Addresses to a Group at Once

Vivid Lizard

I have been trying to assign all of my 152 addresses from the "unassigned" group to the <customer> group to use for invoicing but Quicken only lets me do it one at a time… I can't select a lot of addresses and go to Assign to Group, select the group I want, and press OK. Nothing happens. In fact, it doesn't even show me the <customer> group in the possible groups to use, or any of the <> groups for that matter, just the others. Any help to make this process less of a pain would be appreciated. Thanks