JBoss.orgCommunity Documentation
Only users who are "managers" of a group can create new pages for that group, while others in this group cannot.
Select Add Navigation at the bottom of the Group Navigation form. The groups list will be displayed with the Add Navigation buttons.
Click Add Navigation corresponding to the group you want to add the new page navigation.
After being added, the new group navigation will be displayed in the Group Navigation page.
Each group has only one navigation. If you add a new group navigation that has been existing, there will be a message, informing that you cannot create the navigation.