NOT TESTED:
Code:
<if conditional="$forum['forumid'] == {insert forumid}">
<strong>$vbphrase[subforums]</strong>: $forum[subforums]
</if>
OR for multiple forums
Code:
<if conditional="in_array($forum['forumid'], array({insert, mulitple, forumids})">
<strong>$vbphrase[subforums]</strong>: $forum[subforums]
</if>
NOTE: Replace
{insert forumid},
{insert, mulitple, forumids} with forumid(s).