Pigrecolab

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.

Primary Category

WordPress plugin for setting and displaying primary categories for posts and custom post types. This is a fork from Jacob McKinney's Primary Cate …

bennettmcelwee

Top Cat allows you to specify a main category for your posts. Even though WordPress posts can have more than one category, you may want to specify which of them is the main category for each post. Top Cat lets you do this and also provides template tags for displaying the main category.
Using style sheets, you can then apply different styling to posts based on their main category, even if they belong to the same set of categories. For an example, see my home page at http://www.thunderguy.com/bennett/

Top Cat

Top Cat allows you to specify a main category for your posts. Even though WordPress posts can have more than one category, you may want to specify whi …

Primary Category vs Top Cat