Създаване на “Taxonomies” в WordPress

$labels = array(
    'name' => _x( 'Categories', 'taxonomy general name' ),
    'singular_name' => _x( 'Category', 'taxonomy singular name' ),
    'search_items' =>  __( 'Search Categories' ),
    'all_items' => __( 'All Categories' ),
    'parent_item' => __( 'Parent Category' ),
    'parent_item_colon' => __( 'Parent Category:' ),
    'edit_item' => __( 'Edit Category' ), 
    'update_item' => __( 'Update Category' ),
    'add_new_item' => __( 'Add Category' ),
    'new_item_name' => __( 'New Category' ),
    'menu_name' => __( 'Categories' )
);
 
register_taxonomy('portfolio_categories',array('portfolio'), array(
    'hierarchical' => true,
    'labels' => $labels,
    'query_var' => true,
    'show_ui' => true
));
 
add_filter('manage_edit-portfolio_categories_columns', 'add_portfolio_categories_column' );

‘hierarchical’ => true -> makes a difference between checkboxes and autosuggest