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.
