.When you add a new user, that user is assigned as owner of a parent group. When the user logs in, the context of Group view will automatically be set to this parent group (although a user may change his or her User Profile and set a different default or "login" group). You can also assign that user as an owner of additional groups, using the Assigned Groups dialog.
To open this dialog, open the Users and Roles dialog, select the user
you want to work with, switch to the Groups tab, and click Add .
On the Assigned Groups dialog, the hierarchy of groups is automatically expanded to show any groups belonging to the user's assigned parent group. To see other branches, expand the hierarchy by clicking on group names (not their folders). Select the name of the group (not necessarily a subgroup of the parent group) to which you want to assign the user and click Associate.