Index getting crowded.

[HM666]

You would have to create a new forum under each category by the name that you want and then make all the forums in that category come under that new forum.

Rules Forum (Category)
****-Rules Forum (top forum that show the main link at the top)
***********-Forum 1 (This forum will show in the organized list of forums)
***********-Forum 2 (This forum will show in the organized list of forums)
***********-Forum 3 (This forum will show in the organized list of forums)
***********-Forum 4 (This forum will show in the organized list of forums)
...and so on.

So you would have to edit the forums and change the category or top level forum as the forum that it is directly under to the new forum that you make under the category.