add_filter( 'rwmb_meta_boxes', 'meta_box_tabs_demo_register' );
function meta_box_tabs_demo_register( $meta_boxes ) {
 // 1st Meta Box
  $prefix = 'te';
  $meta_boxes[] = array(
    'title'      => esc_html__('Time Slots','domain'),
    'post_types' => 'domain',
    'tabs'      => array(
        'monday' => array(
            'label' => esc_html__('Monday','domain'),
        ),
        'tuesday'  => array(
            'label' => esc_html__('Tuesday','domain'),
        ),
        'wednesday'    => array(
            'label' => esc_html__('Wednesday','domain'),
        ),
        'thursday'    => array(
            'label' => esc_html__('Thursday','domain'),
        ),
        'friday'    => array(
            'label' => esc_html__('Friday','domain'),
        ),
        'saturday'    => array(
            'label' => esc_html__('Saturday','domain'),
        ),
        'sunday'    => array(
            'label' => esc_html__('Sunday','domain'),
        ),
    ),

    // Tab style: 'default', 'box' or 'left'. Optional
    'tab_style' => 'left',

    // Show meta box wrapper around tabs? true (default) or false. Optional
    'tab_wrapper' => true,


    'fields'    => array(
        array(
            'name'   => esc_html__('Services', 'domain'), // Optional
            'id'     => $prefix.'services',
            'type'   => 'group',
            'clone'  => true,
            // List of sub-fields
            'fields' => array(
                array(
                    'name'  => esc_html__('Title', 'domain'),
                    'desc'  => esc_html__('Provide service title', 'domain'),
                    'id'    => $prefix . 'title',
                    'type'  => 'text',
                ),
            ),
        ),
    ),
);

   return $meta_boxes;

}