{pc:content action="category" catid="0" num="12" siteid="$siteid" order="listorder ASC"}
  {loop $data $c}
    

      

      {loop subcat($c['catid']) $c2}
        

          

          {loop subcat($c2['catid']) $c3}
            

          {/loop}
          

        

        {/loop}
      

    

    {/loop}
  {/pc}