I currently have two post types, Posts and Tutorials. Tutorials are grouped into sets of tutorials within Courses, which I have created with a custom Course taxonomy. Courses can belong to multiple categories, as can Posts. These categories have been created using the built-in category taxonomy. Posts will never belong to a course and should have no association to them.

How can I set up this hierarchy, primarily the linking of a custom Course taxonomy to the built-in Category taxonomy?

1 Answer 1


When you register your custom post type you can set which taxonomies will be registered for this post type. So you can register your custom 'Course' taxonomy and the built-in 'Category' taxonomy with your custom post type 'Tutorials'. And posts will just be registered with 'Category'.

function tutorial_setup_post_type() {
    $args = array(
        'public'    => true,
        'label'     => __( 'Tutorials', 'textdomain' ),
        'taxonomies' => array(
    register_post_type( 'tutorial', $args );
add_action( 'init', 'tutorial_setup_post_type' );


  • I'm familiar with how to link post types to taxonomies. The preference is to link the two taxonomies -- courses and categories in this case, since it's less important to know the category in relation to the post. Is this not at all possible?
    – chm
    Oct 13, 2017 at 20:33
  • Taxonomies are designed to be linked to post_types not other taxonomies. I don't really understand what you are trying to do. But maybe you could use post_meta or a custom non-public post_type to achieve what you want.
    – ngearing
    Oct 14, 2017 at 21:43
  • Thanks for the tips -- I'm trying to convert an existing website with the aforementioned database structure to Wordpress. I think I see now how it can be done with a combination of post types and taxonomies.
    – chm
    Oct 17, 2017 at 13:55

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