Could you please be more specific in regard to what you are trying to accomplish? Please see below for information on group authentication/access:
LDAP Authentication: You can define DSS groups which are automatically mapped to LDAP groups (see Managing groups), or add LDAP users to locally-defined DSS groups. These groups control user access to DSS administrative rights, as well as their access level to DSS projects (read-only, read-write, or no access).
Access to Connections: Within a connection's "security settings", you may allow access to specific groups.