[Victor D]

finally find some time and get it( Sorting conditions implemented in x-cart by default is strange a bit so I have added resorting).

function func_getallsubcat(){
    $a =func_get_categories_list(null, true,"all");
    $b=$a['all_categories'];
    if (!function_exists("sort_cats")){
        function sort_cats($a, $b) {return $a["order_by"]> $b["order_by"];    }
    }
    uasort($b, "sort_cats");

    $c=array();
    foreach ($b as $k=>$v){
        if($v['parentid']!="0")
            $c[$v['parentid']][]=$v;
    }
    return $c;
}
$smarty->assign("allsubcategories", func_getallsubcat());