User groups in the internal database can contain other user groups, called member user groups. For example, an organization might add a member user group called Sales Managers to a parent user group called North America.
Make sure you follow these guidelines:
Member user groups can belong to an LDAP identity source or to the internal database.
The parent user group must belong to the internal database.
In the Security Console, click Identity > User Groups > Manage Existing.
Select the user group to which you want to add other user groups.
From the Action menu, select Add Member User Groups, and click Go.
Select the checkbox next to the user groups that you want to add.