We're finally getting around to uploading datafeeds to google merchant services. We have to edit all of our datafeeds first, to include our correct categories. This would include almost 30 new categories that are not currently in the Viart drop menu.
 
Is it possible to add more?

Hi Sue,
You can define items in "Administration > Static Tables > Google Base Item Types"
HTH

It helps very much, thank you :)