Navigation Groups allow Sections to be grouped together in the Symphony admin interface.
For example, a Symphony project with sections like “Customers,” “Vendors,” “Invoices,” and “Expense Reports” might place the first two sections in a navigation group called “Contacts” and the following two in one called “Finances.” The resulting menu hierarchy would look like Figure 1.
When creating or editing a section, enter the name of the desired navigation group into the Navigation Group field.
Sections with the same navigation group will be listed together in a submenu. If the navigation group entered does not yet exist, a menu item will be created for it.
Note that if all of the sections in a navigation group are hidden, that navigation group will not appear in the menu.
The Big Picture
Navigation groups are only used to group sections in the admin interface. They do not affect the structure of sections or entries, and are not reflected in any front-end output.