I need to calculate 'Total Saving' on an order in woocommerce. The code by @LoicTheAztec in answer for this question does that. Display Custom Total Saving in generated invoice in WooCommerce 3
He also answer to the custom field on order page in this question Add custom field data to WooCommerce order
Now I need to display that 'Total Saving' on Order edit page as a 'Custom Field' How to do that ? in short how to combine these two codes to show Total Savings on order edit page ?
