On this site, I have implemented 2 Taxonomies: Article Types & Topics to classify the posts on this site. The categories are used for the plugins.

I have added the taxonomies to the site using a plugin (see code below), but this code can also be be added to functions.php in you child-theme. I created the first taxonomy using generatewp.com for the second one, I just used copy/paste and then search/replace 🙂

Code:

<?php
/*
Plugin Name: Frontier Pluginsite
Plugin URI: http://wpfrontier.com/
Description: Article type and Topics taxonomies to setup website for your plugin
Author: finnj
Version: 1.0.0
Author URI: hhttp://wpfrontier.com/
*/

// define constants
define('FRONTIER_PLUGINSITE_VERSION', "1.0.0"); 


//*************************************************************************
// Set options on activation
//*************************************************************************

function frontier_pluginsite_set_defaults ()
  {
  }
  
register_activation_hook( __FILE__ , 'frontier_pluginsite_set_defaults');


//*************************************************************************
// Setup Article type taxonomy
//*************************************************************************

function frontier_tax_article_type() {

  $labels = array(
    'name'                       => _x( 'Article types', 'Taxonomy General Name', 'frontier-article-type' ),
    'singular_name'              => _x( 'Article type', 'Taxonomy Singular Name', 'frontier-article-type' ),
    'menu_name'                  => __( 'Article types', 'frontier-article-type' ),
    'all_items'                  => __( 'All Article types', 'frontier-article-type' ),
    'parent_item'                => __( 'Parent Article type', 'frontier-article-type' ),
    'parent_item_colon'          => __( 'Parent Article type:', 'frontier-article-type' ),
    'new_item_name'              => __( 'New Article type Name', 'frontier-article-type' ),
    'add_new_item'               => __( 'Add New Article type', 'frontier-article-type' ),
    'edit_item'                  => __( 'Edit Article type', 'frontier-article-type' ),
    'update_item'                => __( 'Update Article type', 'frontier-article-type' ),
    'separate_items_with_commas' => __( 'Separate Article types with commas', 'frontier-article-type' ),
    'search_items'               => __( 'Search Article types', 'frontier-article-type' ),
    'add_or_remove_items'        => __( 'Add or remove Article types', 'frontier-article-type' ),
    'choose_from_most_used'      => __( 'Choose from the most used Article types', 'frontier-article-type' ),
    'not_found'                  => __( 'Not Found', 'frontier-article-type' ),
  );
  $args = array(
    'labels'                     => $labels,
    'hierarchical'               => true,
    'public'                     => true,
    'show_ui'                    => true,
    'show_admin_column'          => true,
    'show_in_nav_menus'          => true,
    'show_tagcloud'              => true,
    'update_count_callback' 	 => '_update_post_term_count',
    'rewrite' 					 => array( 'slug' => 'article-type' )
  );
  register_taxonomy( 'article-type', array( 'post' ), $args );

}


// Hook into the 'init' action
add_action( 'init', 'frontier_tax_article_type', 0 );


//*************************************************************************
// Setup Topics taxonomy
//*************************************************************************

function frontier_tax_topics() {

  $labels = array(
    'name'                       => _x( 'Topics', 'Taxonomy General Name', 'frontier-topics' ),
    'singular_name'              => _x( 'Topic', 'Taxonomy Singular Name', 'frontier-topics' ),
    'menu_name'                  => __( 'Topics', 'frontier-topics' ),
    'all_items'                  => __( 'All Topics', 'frontier-topics' ),
    'parent_item'                => __( 'Parent Topic', 'frontier-topics' ),
    'parent_item_colon'          => __( 'Parent Topic:', 'frontier-topics' ),
    'new_item_name'              => __( 'New Topic Name', 'frontier-topics' ),
    'add_new_item'               => __( 'Add New Topic', 'frontier-topics' ),
    'edit_item'                  => __( 'Edit Topic', 'frontier-topics' ),
    'update_item'                => __( 'Update Topic', 'frontier-topics' ),
    'separate_items_with_commas' => __( 'Separate Topics with commas', 'frontier-topics' ),
    'search_items'               => __( 'Search Topics', 'frontier-topics' ),
    'add_or_remove_items'        => __( 'Add or remove Topics', 'frontier-topics' ),
    'choose_from_most_used'      => __( 'Choose from the most used Topics', 'frontier-topics' ),
    'not_found'                  => __( 'Not Found', 'frontier-topics' ),
  );
  $args = array(
    'labels'                     => $labels,
    'hierarchical'               => true,
    'public'                     => true,
    'show_ui'                    => true,
    'show_admin_column'          => true,
    'show_in_nav_menus'          => true,
    'show_tagcloud'              => true,
    'update_count_callback' 	 => '_update_post_term_count',
    'rewrite' 					 => array( 'slug' => 'topics' )
  );
  register_taxonomy( 'topics', array( 'post' ), $args );

}


// Hook into the 'init' action
add_action( 'init', 'frontier_tax_topics', 0 );


//*************************************************************************
// Translation
//*************************************************************************
function frontier_pluginsite_translation() 
  {
  load_plugin_textdomain('frontier-pluginsite', false, dirname( plugin_basename( __FILE__ ) ).'/language');
  }
add_action('plugins_loaded', 'frontier_pluginsite_translation');


//*************************************************************************
// End plugin
//*************************************************************************

?>