title: How to add child category to multiple Parent category in Wordpress
body: <p>Wordpress Expert,</p>
  
  <p>I need to add "child" categories to multiple parents category.</p>
  
  <blockquote>
    <p>For Example: These are two Parents categories: <strong>National Flowers</strong>,
    <strong>National Animals</strong></p>
    
    <p>Whereas These are five child categories:  <strong>japan</strong>, <strong>china</strong>, <strong>england</strong>,
    <strong>denmark</strong>, <strong>usa</strong></p>
  </blockquote>
  
  <p>Now i want to add child categories to both of them parent categories when write post. Like this way</p>
  
  <pre><code>National Flowers
   Japan
   china
   England
   Denmark
   USA
  
  National Animals
   Japan
   china
   England
   Denmark
   USA
  </code></pre>
  
  <p><strong>Note:</strong> I don't want to create multiple child category...means the same child category like "<strong>japan</strong>" should be used in any parent category...I dont want to create double "japan" category. </p>
  
  <p>In simple words: Once i create any child category, then it should be able to add it in multiple parent categories like the the above structure where "japan" assigned to multiple category. Thanks and hope to see any expert here with plugin or code. </p>