$oi_catalog = new_cmb2_box( array(
            'id' => $prefix . 'catalog_metabox',
            'title' => esc_attr__('Catalog settings'),
            'object_types' => array('term'),
            'taxonomies' => array('product_category'),
            'context' => 'normal',
            'priority' => 'high',
            'show_names' => true
        )
    );

    $oi_catalog_group_id = $oi_catalog->add_field( array(
            'id'          => '_cmb_catalog_repeat_group',
            'type'        => 'group',
            'options'     => array(
                'group_title'   => __( 'Banner {#}'),
                'add_button'    => __( 'Add banner'),
                'remove_button' => __( 'Remove banner'),
                'closed'    => false,
                'sortable' => false
            )
        )
    );

    $oi_catalog->add_group_field($oi_catalog_group_id, array(
            'name' => 'URL',
            'id'   => 'url',
            'type' => 'text_url'
        )
    );