Address book help

How can I change information within a group that does not change in the All Contacts? Specifically I am creating a group of women invited to a bridal shower from a group of people invited to the wedding. I don't want the wedding group to change, but I want to remaove the man's name for the Bridal shower group? When I drag the contact into the Bridal shower group and edit the name field, it also changes in the Wedding invitations group.