title: Remove some categories from the URL Permalink structure /%category%/?
body: <p>In <strong>Wordpress Permalink</strong> : I use  <code>/%category%/%postname%/</code></p>
  
  <p>With categories like « News », « Formation », « Events » etc.. (<strong>true categories</strong>)</p>
  
  <p>But I have some categories only for display features like « slider1 », « homepagedisplay » or some child category… (<strong>« false » categories</strong>)</p>
  
  <p>And <strong>many posts, are both</strong> in « true » and « false » categories and get false cat for url structure... : <code>test.com/slider1/my-post</code> .....</p>
  
  <ul>
  <li><strong>I want to remove « false » categories from the « <code>%category%</code> »<br>
  Permalink structure</strong>. </li>
  <li>Is there a hook filter to do that in PHP ? Or a plugin to exclude them ?</li>
  </ul>
  
  <p>Thanks for help</p>