Yes, the page hierarchy is setup like for example the following:
-root
--/item1
--/item1/submenuitem1
--/item1/submenuitem2
--/item1/submenuitem3
--/item1/submenuitem4
--/item2
--/item3
--/item3/submenuitem1
--/item3/submenuitem2
--/item3/submenuitem2/subsubmenuitem1
--/item3/submenuitem2/subsubmenuitem2
--/item3/submenuitem2/subsubmenuitem3
--/item3/submenuitem3
--/item3/submenuitem4
The key here is that Item1's dropdown menu will be a MegaMenu which should use two div's to represent a two column layout. however, Item3's dropdown menu should just be a regular drop down with its 'submenuitem2' also being a regular dropdown.
What I'm only looking at is getting the output right in terms of basic DIV, UL and LI tags with relevant classnames to work with Bootstrap.