register_taxonomy

register_taxonomy.php

add_action('init', array($this, 'create_stores_nonhierarchical_taxonomy'));

function create_stores_nonhierarchical_taxonomy() {

// Labels part for the GUI

  $labels = array(
    'name' => _x( 'Store  Categories', $this -> textdomain ),
    'singular_name' => _x( 'Store  Categories', $this -> textdomain ),
    'search_items' =>  __( 'Search Store  Categories',$this -> textdomain ),
    'popular_items' => __( 'Popular Store  Categories',$this -> textdomain ),
    'all_items' => __( 'All Store  Categories ',$this -> textdomain ),
    'parent_item' => null,
    'parent_item_colon' => null,
    'edit_item' => __( 'Edit Store Categories',$this -> textdomain ), 
    'update_item' => __( 'Update Store Categories' ,$this -> textdomain),
    'add_new_item' => __( 'Add New Store Categories',$this -> textdomain ),
    'new_item_name' => __( 'New Store Categories Name',$this -> textdomain ),
    'add_or_remove_items' => __( 'Add or remove Store Categories',$this -> textdomain ),
    'choose_from_most_used' => __( 'Choose from the most used Store Categories',$this -> textdomain ),
    'menu_name' => __( 'Store Categories',$this -> textdomain ),
  ); 

// Now register the non-hierarchical taxonomy like tag

  register_taxonomy('my_cat',$this->post_type,array(
    'labels'            => $labels,
        'hierarchical'      => true,
        'show_ui'           => true,
        'how_in_nav_menus'  => true,
        'public'            => true,
        'show_admin_column' => true,
        'query_var'         => true,
    'rewrite' => array( 'slug' => 'my_cat' ),
  ));
}