How to add another ordercomments field to woocommerce checkout

To add another order notes custom fields :

add in functions.php :

/**
 * add new order note field
 */
add_filter( 'woocommerce_checkout_fields' , 'customizing_checkout_fields', 10, 1 );
function customizing_checkout_fields( $fields ) {

    // Define new  custom Order Notes field data array
    $customer_note  = array(
        'type' => 'textarea',
        'class' => array('form-row-wide', 'notes'),
        'label' => __('Order Notes New', 'woocommerce'),
        'placeholder' => _x('Notes about your order, e.g. special notes for delivery.', 'placeholder', 'woocommerce')
    );

    $fields['order']['billing_new_customer_note'] = $customer_note;

    return $fields;
}

/**
 * Process the checkout
 */
add_action('woocommerce_checkout_process', 'customise_checkout_field_process');
function customise_checkout_field_process()
{
  #if the field is set, if not then show an error message.
  if (!$_POST['billing_new_customer_note']) wc_add_notice(__('Please enter Order Notes New value.') , 'error');
}

/**
 * Update the order meta with field value
 */
add_action('woocommerce_checkout_update_order_meta', 'custome_checkout_field_update_order_meta');
function custome_checkout_field_update_order_meta($order_id)
{
  if (!empty($_POST['billing_new_customer_note'])) {
    update_post_meta($order_id, 'billing_new_customer_note', sanitize_text_field($_POST['billing_new_customer_note']));
  }
}

Display field value on the order edit page

add_action( 'woocommerce_admin_order_data_after_shipping_address', 'custom_checkout_field_display_admin_order_edit', 10, 1 );
  function custom_checkout_field_display_admin_order_edit($order){
        echo '<p><strong>'.__('Order Notes New').':</strong> <br/>' . get_post_meta( $order->get_id(), 'billing_new_customer_note', true ) . '</p>';
    }

Display field In Order review page after order note

add_action('woocommerce_order_details_after_order_table','custom_checkout_field_display_order_reviews',20);
    function custom_checkout_field_display_order_reviews( $order ){  
        ?>
        <table class="woocommerce-table shop_table">
            <tbody>
                <tr>
                    <th>Custom order note </th>
                    <td><?php echo "<strong>".get_post_meta( $order->get_id(), 'billing_new_customer_note', true )."</strong>"; ?></td>
                </tr>
             </tbody>
        </table>
    <?php }