<?php 

$labels_pro_cat = array(
		'name'              => _x( 'Extra Product Category', 'taxonomy general name' ),
		'singular_name'     => _x( 'Extra Product Category', 'taxonomy singular name' ),
		'search_items'      => __( 'Search Category' ),
		'all_items'         => __( 'All Extra Product  Category' ),
		'parent_item'       => __( 'Parent Category' ),
		'parent_item_colon' => __( 'Parent Category' ),
		'edit_item'         => __( 'Edit Category' ),
		'update_item'       => __( 'Update Category' ),
		'add_new_item'      => __( 'Add New Category' ),
		'new_item_name'     => __( 'New Category' ),
		'menu_name'         => __( 'Product Extra Category' ),
	);

	$args_pro_cat_taxonomy = array(
		'labels' => $labels_pro_cat,
		'hierarchical' 	=> true,
		'public'		=> true,		
		'show_ui'           => true,
		'show_admin_column' => true,
		'query_var'         => true,
		'show_in_nav_menus' => true,		
		'_builtin'		=> false,
	);
	register_taxonomy( 'product_category', 'product', $args_pro_cat_taxonomy );
