Hello,
thank you for your reply.
The GTIN and SKU have been saved on my products as an attribute. I have not found a different way to add them.
I have created a variable product on Woocommerce, with 4 variants according to its size. Then, I created an attribute (GTIN) and I have added the 4 GTIN, but I can’t find a way to assign the GTIN to a specific variant.
I could only do it if the product is not a variable product, but a single product.
Waiting for your kind reply.
Emanuele d.V.