I have an Excel file that came from a built-in products’ export of a WC e-shop. I don’t know how it ended up being an Excel file. I know that built-in WC export sub system produces CSV files.

Anyway, before turning it back to a CSV to import the products it contains to another WC e-shop, I’d like to add one more column that would be imported as a custom postmeta. Is this possible? I mean, I can easily add a column in Excel of course, but then in the column matching screen in WC importer, can I somehow match this column to be imported in a custom postmeta field?