Since you have installed Categories Dressing, you can add all of the top cat ids to the explode() function in this part of tpl_categories.php:
PHP Code:
// categories dressing - add divider above specified cats
if (in_array(str_replace("cPath=","",$box_categories_array[$i]['path']), explode(",",'3,22,21_56'))) { //replace numbers with your cat ids separated by commas
$content .= '<hr class="catBoxDivider" />' . "\n";
}
You may want to leave out the first category so it doesn't have a divider above it.
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