{pboot:nav}
<li><a href="[nav:link]">{nav:name}</a>
  {pboot:if('[nav:soncount]' > 0)}
  <div>
    {pboot:2nav parent="[nav:scode]"}
    <a href="[2nav:link]">{2nav:name}</a>
    {/pboot:2nav}
  </div>
  {/pboot:if}
</li>
{/pboot:nav}