Hello, thanks for Your reply.
So I have to add column title before val1, val2, val3, etc.?
Do the column titles have to be exactly the same as the entries present at the time of import (like in this URL: https://github.com/woocommerce/woocommerce/wiki/Product-CSV-Import-Schema#csv-columns-and-formatting) or I just have to add column title about my CSV?
Thanks.