It is necessary to modify functions in functions.php woocommerce file. Currently, the script contained there sends order and product information to excel. We need to add another field which will be exported. This field will contain similar data as SKU. There are GTIN and MPN fields already added in the store that are not used. I need someone to modify the current script so that the data filled out in woocommerce in this field will be exported along with the other data.