title: How to convert posts to Custom Post Types without losing category
body: <p>I'm using the Convert Post Types plugin, this plugin works without any problem
  but the problem is that when I convert all the post to my custom post type they lose all categories leaving without any category.
  <a href="https://wordpress.org/plugins/convert-post-types/" rel="nofollow noreferrer">https://wordpress.org/plugins/convert-post-types/</a></p>
  
  <p>I have selected both categories before converting posts to custom post type, but doing so all posts converted to custom post type appear with all categories selected in my custom post type.</p>
  
  <p>I have created both categories with the same slug and name tando in posts as in custom post type.</p>
  
  <p>How can I make all my posts converted to post type cusmtom appear
  in the categories of my custom post type?</p>
  
  <p>I have about 16,000 posts.</p>