{foreach $menus as $one} {notempty name='one.sub'}

{foreach $one.sub as $two} {empty name='two.sub'}
• {$two.title}
{else}
• {$two.title}

  {foreach $two.sub as $thr}

  {$thr.title}

  {/foreach}

{/empty} {/foreach}

{/notempty} {/foreach}