All of our menus have limited space for main pages, but they have room for 'Sub-pages', allowing essentially unlimited pages.
To create a sub-page:
- Add a new page
- Look under 'Page Attributes' near the 'Publish' or 'Update' button
- Choose a 'Parent' page
The page you are editing will now be grouped under that 'Parent' page.
Now, when you look at the list of pages in the backend, subpages will be indented under their parent pages. On the site itself, these subpages will display in sub menus.