[Samba] W2k can't recognise Samba ldap groups of users

[Thomas SECHET]

Hello,

We recently install a Samba PDC for linux and W2k clients. 
I don't find how to apply security policies editing with Poledit to
users-groups defined by ldap organisation units. Policies are only
working with default user and individual user. 
I see with poledit on the domain two groups named "domain users" or
"admin users" but I don't understand what they are. I don't see groups
defined with ldap tools.

My question is how can I configure groups to be able to be recognized
and managed by poledit ?

Thanks for contributions.

Thomas