Your question is not clear for me.
Anyway, you can change everything related to category in forumhome_forumbit_level1_nopost
<tr>
<td class="tcat" colspan="<if condition="$vboptions['showmoderatorcolumn']">6<else />5</if>">
<if condition="$childforumbits">
<a style="float:$stylevar[right]" href="#top" onclick="return toggle_collapse('forumbit_$forumid')"><img id="collapseimg_forumbit_$forumid" src="$stylevar[imgdir_button]/collapse_tcat{$collapseimg_forumid}.gif" alt="" border="0" /></a>
</if>
<a href="forumdisplay.php?$session[sessionurl]f=$forum[forumid]">$forum[title]</a>
<if condition="$show['forumdescription']"><div class="smallfont">$forum[description]</div></if>
<if condition="$show['subforums']"><div class="smallfont"><strong>$vbphrase[subforums]</strong>: $forum[subforums]</div></if>
</td>
</tr>