Hello,
Log in to your WordPress site and go to your Dashboard. In that menu, hover over “WooCommerce” and then click on “Products” .
Find the product that you want to change the SKU for and click on it .
This will take you to the product editing page.;”> On the product editing page, scroll down until you see the “Inventory” section. In that section, you’ll see a field labeled “SKU.” Change the SKU in that field , and then click on the “Update” button at the bottom of the page.”
Best Regards.