[Andreas]

AFAIK there is none.

A draft code could be (not tested)

PHP Code:

require_once('./includes/functions_misc.php');
require_once('./includes/adminfunctions_forums.php');
$forum = array(
        'parentid' => $parentid,
        'title' => 'Some foobar title',
        'description' => 'Some foobar description'
);
$parentlist = fetch_forum_parentlist($forum['parentid']);
$DB_site->query(fetch_query_sql($forum, 'forum'));

$forumid = $DB_site->insert_id();
$DB_site->query("
        UPDATE " . TABLE_PREFIX . "forum
        SET parentlist='" . addslashes("$forumid,$parentlist") . "',
        childlist = '$forumid,-1'
        WHERE forumid = $forumid
");

build_forum_permissions();