How to add (On Shopify or whatever the easiest way) various item particulars ie color, size, etc required to get my product listed for sale on Google Merchant Center? I have attachment below but cannot find how to add these things inside of Shopify? What is easiest way to add the requirements to get listed on Google Merchant Center???
It's unbelievable that this question has gone without an answer for so long. The Shopify Product Page and the Google Shopping App together do a lot of that for you. The attributes required by Google must either be in the variant section of your product page or added to the The Google Shopping App. The app will capture info from both your entries in the app and what is in the variant section of your product pages. The app is free but has a lot of quirks that you'll have to learn to get around over time.
Hope that helps.
This is what worked for me. Assuming the reader is using a laptop...
As was shared before under a different profile, Google provides the required information for each type of product here. It can be a bit scary at first, so here's an unofficial summary that I created and often reference.
Required for All Products
These have red fonts on the link referenced above
Required for Apparel