For LDAP services, you can add groups (instead of individual members) to the group’s members list. Doing so causes any users belonging to the included group to become a member of the receiving group. For example, if Neil Armstrong is a member of the Engineering Managers group, and you make the Engineering Managers group a member of the Engineering Personnel group, then Neil Armstrong is also a member of the Engineering Personnel group.
To add a group to the members list of another group, add the group as if it were a user entry. For more information, see Adding Group Members.