Best Answer Rob , 20 April 2013 - 02:28 PM
With WordPress, you'll not get a great-grandchild menu item in WordPress, normally, without considerable custom coding. There may be plugins out there that will extend this.
This topic may be helpful: http://wordpress.org...custom-menus-30
I think that for some odd purpose, WP limited the number of child menu items when the menu is used vertically in a sidebar. I've tried this myself a few times and haven't had much luck past.
Personally, I'd recommend using UberMenu from CodeCanyon.net. I has many built-in overrides and is very easy to customize.Go to the full post