Hi, I asked this question a year or so ago when I was trying out CS-Cart and never found a solution. A year later, I wanted to reach out to see if there were any updates.
When you send out a feed to Google, is it possible to send GTINs and any other data you want (custom type of fields) for VARIATIONS of a product? For example T-Shirt is the SKU. If I have T-Shirt-BLUE as a variation of T-Shirt and I send this out to Google in a feed, is it possible to associate a GTIN for "T-Shirt-Blue?"
I know when I tried CS-Cart about a year ago, it was not native to the feed. The variation weren't even in the feed from what I could tell. I could be wrong, but that's what I remember.
I used to use it before Google went commercial. GTIN, UPC, ect...wasn't available in CSC back then but now I believe that it's included when you use the Google export addon. You still need to set up the GTIN as a feature for products.
But can you add features to "variations"? I don't think you can for "option combinations" but don't know if they made all of a product's properties available as individual properties when a product has "variations".