Second level subcategory

Found the solution! 🙂

$taxonomies = array(CUSTOM_CAT_TYPE);
        foreach($taxonomies as $tax)
         {
             $args = array(
                  'orderby'         => 'name',
                  'show_count'      => 1,
                  'pad_counts'      => 1,
                  'hierarchical'    => 1,
                  'hide_empty'      => 0,
                  'taxonomy'        => $tax,
                );

             wp_dropdown_categories( $args );
         }

Thanks for helping out!