[tbworld]

I did a quick search for documentation on Navigation Manager. Unfortunately, I didn't find any on vbulletin or vbulletin.org, but I did find some videos on google. Google this 'vbulletin navigation manager overview'.

I have not viewed any of them to know if they are useful, but it is a start.
It can be a little frustrating when you are new to all of this! Hang in there ;

If I understand you correctly, what you wish to do is just use the forumdisplay script to display your forums under a parent header.
being something like" /forum/forumdisplay.php?2-ParentForum"

Provide us a link, then we give you a real world example.