二级嵌套

{pboot:nav}                      
    <a href="[nav:link]">[nav:name]</a>   
    {pboot:2nav parent=[nav:scode]}     
        <a href="[2nav:link]">[2nav:name]</a>   
    {/pboot:2nav} 
{/pboot:nav}

三级嵌套

{pboot:nav}
    <a href="[nav:link]">[nav:name]</a>   
    {pboot:2nav parent=[nav:scode]}     
        <a href="[2nav:link]">[2nav:name]</a>     
            {pboot:3nav parent=[2nav:scode]}       
                <a href="[3nav:link]">[3nav:name]</a>     
            {/pboot:3nav}   
     {/pboot:2nav} 
{/pboot:nav}

第三级替换为二级正文

{pboot:nav}
    <a href="[nav:link]">[nav:name]</a>   
    {pboot:2nav parent=[nav:scode]}     
        <a href="[2nav:link]">[2nav:name]</a>     
            {pboot:list scode=[2nav:scode] num=10}
            <li><a href="[list:link]">[list:title]</a></li>
    	{/pboot:list} 
     {/pboot:2nav} 
{/pboot:nav}