title: Change class of submenu-item of two level menu wordpress by wordpress functions only
body: <p>I have integrated a html template into wordpress theme. But, menu is trouble for me. I have menu bar in header part. It has also submenu. I have applied css classes to 1st level menu items. But, on submenu items I am not able to add classes through wordpress functions. Is there any wordpress functions to do so?</p>
  
  <p>Below, is the code for menubar which is coded by wordpress function in <code>header.php</code>.</p>
  
  <pre><code>&lt;?php
  wp_nav_menu(
      array(
          'theme_location' =&gt; 'new-menu',
          'container_class' =&gt; 'ske-menu',
          'container_id' =&gt; 'skenav',
          'items_wrap' =&gt; '&lt;ul id="menu-main" class="menu sf-js-enabled sf-arrows"&gt;%3$s&lt;/ul&gt;'
      )
  );
  ?&gt;
  </code></pre>
  
  <p>I have menu like below image and I am unable to add classes to submenu items.</p>
  
  <p><img src="https://i.stack.imgur.com/JPWvm.jpg" alt="enter image description here"></p>
  
  <p>That means on hover of COMPANY, I am not getting "About Us", "Executive Team" (etc) submenus.</p>
  
  <p>Thanks in advance!</p>