Group navigations are dynamically added to the user navigation at login. This allows users to see the menu of all pages assigned to any groups they belong to.
The group navigation menu is configured by three XML files (navigation.xml, pages.xml and portlet-preferences.xml). The syntax used in these files is the same as those covered in Section 2.5.2, “Portal Navigation”.
They are also located in the {templateLocation}/{ownerType}/{predefinedOwner} directory with ownerType is group and predefinedOwner is the path to the group. For example, portal.war/WEB-INF/conf/portal/group/platform/administrators/.