function p52_quote_post_type() {
    register_post_type( 'p52-quote',
        array(
            'labels' => array(
                'name' => _x('Quote', 'post type general name'),
                'singular_name' => _x('Quote', 'post type singular name'),
                'add_new' => _x('Add New', 'quote'),
                'add_new_item' => __('Add New Quote'),
                'edit_item' => __('Edit Quote'),
                'new_item' => __('New Quote'),
                'all_items' => __('All Quotes'),
                'view_item' => __('View Quote'),
                'search_items' => __('Search Quotes'),
                'not_found' =>  __('Quote wasn\'t found'),
                'not_found_in_trash' => __('Quote wasn\'t found in Trash'),
                'parent_item_colon' => '',
                'menu_name' => 'P52 Quotes'
            ),
            'public' => true,
            'publicly_queryable' => true,
            'show_in_menu' => true,
            'query_var' => true,
            'supports' => array( 'title' ),
            'capability_type' => 'post',
            'rewrite' => true,
            'menu_position' => 5,
            'hierarchical' => false,
            'menu_icon' => 'dashicons-admin-links',
        )
    );
}
add_action( 'init', 'p52_quote_post_type' );

/***************************
* create contact metaboxes
***************************/
function p52_register_quote_contact_meta_boxes( $meta_boxes ) {
    $prefix = 'p52_quote_';

    // Get all customer custom post type posts
    $customers = get_posts( array(
        'posts_per_page' => -1,
        'post_type' => 'p52-contact'
    ) );

    // start customer
    $meta_boxes[] = array(
        'id'       => $prefix . 'customer',
        'title'    => 'Customer Info',
        'pages'    => 'p52-quote',
        'context'  => 'normal',
        'priority' => 'low',


        'fields' => array(

            array(
                'name'  => 'Name',
                'id'    => $prefix . 'name',
                'type'  => 'post',
                'post_type' => 'p52-contact',
                'placeholder' => 'Select a Customer',
                'columns' => 6
            ),


            array(
                'name'  => 'Company',
                'id'    => $prefix . 'company',
                'type'  => 'text',
                'columns' => 6
            ),

            array(
                'name'  => 'Email',
                'id'    => $prefix . 'email',
                'type'  => 'text',
                'columns' => 6
            ),

            array(
                'name'  => 'Phone',
                'id'    => $prefix . 'phone',
                'type'  => 'hidden',
                'columns' => 6
            ),

            array(
                'name'  => 'Address',
                'id'    => $prefix . 'address',
                'type'  => 'textarea',
                'columns' => 6
            ),

            array(
                'name'  => 'Delivery Address',
                'id'    => $prefix . 'delivery_address',
                'type'  => 'textarea',
                'columns' => 6
            ),


        ), // end customer fields
    ); // end customer

    // Append phone or another field of customer to meta box above.
    foreach ( $customers as $customer )
    {
        // Show this phone field if match name.
        $meta_box['fields'][] = array(
            'name'      => 'Phone',
            'id'        => $prefix . 'phone_' . $customer->ID,
            'type'      => 'text',
            'std'       => get_post_meta( $customer->ID, 'p52_quote_phone', true ),
            'visible'   => array( $prefix . 'name', $customer->ID )
        );
    }
    $meta_boxes[] = $meta_box;

    return $meta_boxes;
}

add_filter( 'rwmb_meta_boxes', 'p52_register_quote_contact_meta_boxes' );

// Save data to phone field
add_action('rwmb_before_save_post', function($post_id)
{
    // Get person ID to save from "Select a Customer" field
    $person_to_save = intval( $_POST['p52_quote_name'] );
    // Save related field to phone field
    $_POST['p52_quote_phone'] = $_POST['p52_quote_phone_' . $person_to_save];
    // Unset all hidden fields
    foreach ( $_POST as $key => $value )
    {
        if ( strpos( $key, 'p52_quote_phone_' ) )
            unset( $_POST[$key] );
    }
} );