add subtotal to edit order admin woocommerce

functions.php

<?php
// Add to functions.php of your theme or child theme. Don't include the php tag above this line!

/**
 * This code will add subtotal to the edit order admin in WooCommerce.
 *
 * @author Sprucely Designed <support@sprucely.net>
 * @see https://github.com/woocommerce/woocommerce/issues/17172
 * @param int $order_id Order ID retreived from db for order being displayed.
 */
function sprucely_add_sub_total( $order_id ) {
	$order = wc_get_order( $order_id );
	?><tr>
		<td class="label">Subtotal: <small>(after discount/before shipping & tax)</small></td>
		<td width="1%"></td>
		<td class="total"><?php echo $order->get_subtotal_to_display(); ?></td>
	</tr>
	<?php
}
add_action( 'woocommerce_admin_order_totals_after_discount', 'sprucely_add_sub_total', 10, 1 );