LDAP - How to get the Groups out of Domino? Just getting people

Our LDAP Server is accessing our Domino Server (Mailserver), so far so good.

Our Lotus Quickr Server uses LDAP, not Domino Directory. If we are adding members to a place, we are only able to add peoples but no groups.

What do I have to do, to get the groups. I know not much about LDAP.

Thanks in advance