We'll create fresh WordPress site with Primary Category installed. You have 20 minutes to test the plugin after that site we'll be deleted.
This plugin adds radiobuttons near every category (even if you add a new category) so you can choose the primary category of your post **. Selecting a primary category and updating the post saves this data into a custom field with a meta key of “primary_category”.
To display a list of all posts with a particular primary category, use the shortcode [primary-category name=”CATEGORY NAME” post_type=”POST TYPE”] where CATEGORY NAME is the name of the primary category you wish to display and POST TYPE is the custom post type name. If a name is not specified, the shortcode will default to all posts with “uncategorized” set as the primary category. images or post.