functions.php

<?php


/**
 * Add 'page-attributes' to Portfolio Post Type
 *
 * @param array $args, arguments passed to register_post_type
 * @return array $args
 */
function be_portfolio_post_type_args( $args ) {
	$args['supports'][] = 'page-attributes';
	return $args;
}
add_filter( 'portfolioposttype_args', 'be_portfolio_post_type_args' );

/**
 * Sort projects by menu order 
 *
 */
function be_portfolio_query( $query ) {
	if( $query->is_main_query() && !is_admin() && ( is_post_type_archive( 'portfolio' ) || is_tax( array( 'portfolio_category', 'portfolio_tag' ) ) ) ) {
		$query->set( 'orderby', 'menu_order' );
		$query->set( 'order', 'ASC' );
	}
}
add_action( 'pre_get_posts', 'be_portfolio_query' );