/** -------------- ADD CUSTOM POST TYPES ----------------- **/

// The register_post_type() function is not to be used before the 'init'.

add_action( 'init', 'my_custom_init' );

/* Here's how to create your customized labels */

function my_custom_init() {
	
	$labels = array(
		'name' => _x( 'Case Studies', 'post type general name' ), // Tip: _x('') is used for localization
		'singular_name' => _x( 'Case Study', 'post type singular name' ),
		'add_new' => _x( 'Add New', 'book' ),
		'add_new_item' => __( 'Add New Case Study' ),
		'edit_item' => __( 'Edit Case Study' ),
		'new_item' => __( 'New Case Study' ),
		'view_item' => __( 'View Case Study' ),
		'search_items' => __( 'Search Case Studies' ),
		'not_found' =>  __( 'No Case Studies found' ),
		'not_found_in_trash' => __( 'No Case Studies found in Trash' ),
		'parent_item_colon' => ''
	);

	// Create an array for the $args
	
	$args = array( 'labels' => $labels, /* NOTICE: the $labels variable is used here... */
		'public' => true,
		'publicly_queryable' => true,
		'show_ui' => true,
		'show_in_nav_menus' => true,
		'query_var' => true,
		'rewrite' => true,
		'capability_type' => 'post',
		'hierarchical' => true,
		'menu_position' => null,
		'has_archive' => true,
		'rewrite' => true,
		'taxonomies' => array( 'Project Type' ),
		'supports' => array( 'title', 'editor', 'author', 'thumbnail', 'excerpt', 'custom-fields', 'page-attributes' )
	); 

	register_post_type( 'case-studies', $args ); /* Register it and move on */
}


/** -------------- REGISTER CUSTOM TAXONOMIES ----------------- **/


//hook into the init action and call create_book_taxonomies when it fires
add_action( 'init', 'create_casestudies_taxonomies', 0 );

//create two taxonomies, genres and writers for the post type "book"
function create_casestudies_taxonomies() 
{
  // Add new taxonomy, make it hierarchical (like categories)
  $labels = array(
    'name' => _x( 'Project Type', 'taxonomy general name' ),
    'singular_name' => _x( 'Project Type', 'taxonomy singular name' ),
    'search_items' =>  __( 'Search Project Types' ),
    'all_items' => __( 'All Project Types' ),
    'parent_item' => __( 'Parent Project Type' ),
    'parent_item_colon' => __( 'Parent Project Type:' ),
    'edit_item' => __( 'Edit Project Type' ), 
    'update_item' => __( 'Update Project Type' ),
    'add_new_item' => __( 'Add New Project Type' ),
    'new_item_name' => __( 'New Project Type Name' ),
    'menu_name' => __( 'Project Type' ),
  ); 	

  register_taxonomy('genre',array('case-studies'), array(
    'hierarchical' => true,
    'labels' => $labels,
    'show_ui' => true,
    'query_var' => true,
    'rewrite' => array( 'slug' => 'project' ),
  ));

}

Register a Custom Post Type and a Custom Taxonomy in Wordpress

Wordpress register Custom Post Type and Custom Taxonomy

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