If you have set of menu items that you repeat across several menus, it can be bit of pain when one of that set needs updating and you have to go through all your menus changing each one..
If you then need to maintain one of the in the subset, you need to update one menu, and the change gets reflected in all the other menus that include that subset..
As well as being able to add Posts, Categories, etc, to your menu, you should now see metabox for.
Navigation Menus which has checkboxes for each of your defined Menus ..
All you need to do is create your submenu, open the menu you want to insert the new submenu into, select the submenu from Navigation Menus metabox, Add it, and position it..
However, if you were to also add Menu B into Menu C as Navigation Menu item, then no matter.
Screen Options you the ability to turn off on metaboxes, and it's possible that Naviagtion Menus is turned off just activate Screen Options and Navigation Menus metabox should appear ...
It's possible that the inclusion might have created perpetual loop, and the plugin won't allow that it refuses to output any menu that is contained within itself.
The first name was the menu that was requested to be displayed, and it included the 2nd.
Browse the code, check out SVN repository, or subscribe to the development log by RSS...
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