Getting all users in the same group

I have most of my family members in the LDAPv3/127.0.0.1 directory but a few like the Server Admin and
PostMaster and WebMaster I created in server1.local. I would like to phave them all be a member of
a group I’ve named ‘workgroup’. I created that group in the LDAPv3 direrectory but when I switch directories
to ‘.local’ and select a user there, the group ‘workgroup’ is not available and when I try to create the group
anew, the OD software says “duplicte group” — Can this be done? I could use any tutorial advice about
accounts and groups.
Thanks,
Jay