Greetings. After I created Pages and Sub Pages, then used the 'Display Options > Menu Manager' to create the menu I find that the Sub Menu items are not linked to a page.
Then I used 'Appearance' > 'Menus' since this is the newly recommended way to create menus. Using this method all I see are menu items with no sub menus underneath. I have found no documentation to resolve this.
The website is http://core4innovative.com