you used the term "headers".
the header is the section at the top of the page. usually one is referring to the image/banner that is there when using the term "header".
in your case you are apparently referring to having different categories.
each one of those are categories.
In forum management make a new forum.
Then make another forum.
Parent: the category you just made.
Then you need to set permissions so everyone can see it:
Admin control panel>Permissions>Groups forum permissions.
Set the registered users to be able to see and post in it:
Registered users>Standard access
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OK, so what's the speed of dark?