taxonomies.php

<?php
function name_of_taxonomy_create() {
	register_taxonomy(
		'your_taxonomy_name',
		array('post_types_here'),
		array(
			'label' => __( 'Your Taxonomy Label' ),
			'rewrite' => array( 'slug' => 'your_taxonomy_name', 'with_front' => false ),
			'hierarchical' => true,
			'show_admin_column' => true
		)
	);
}
add_action( 'init', 'name_of_taxonomy_create' );
?>