<?php
/**
* WooCommerce admin order add table header
* @link https://v123.tw/woocommerce-admin-order-items-add-custom-column/
* @see wp-content\plugins\woocommerce\includes\admin\meta-boxes\views\html-order-items.php
*/
add_action('woocommerce_admin_order_item_headers', 'pd_admin_order_items_headers');
function pd_admin_order_items_headers($order)
{
?>
<th class="line_customtitle sortable" data-sort="your-sort-option">
Custom Title
</th>
<?php
}
/**
* WooCommerce admin order add table content
* @link https://v123.tw/woocommerce-admin-order-items-add-custom-column/
* @see wp-content\plugins\woocommerce\includes\admin\meta-boxes\views\html-order-items.php
*/
add_action('woocommerce_admin_order_item_values', 'pd_admin_order_item_values', 10, 3);
function pd_admin_order_item_values($product, $item, $item_id)
{
?>
<td class="line_customtitle">
Custom Content
</td>
<?php
}https://stackoverflow.com/a/25645735/6784662