One of the hardest things to do well in Shopify is to automatically export all parent and child products to the various CSEs (consumer shopping engines).
If you’ve been struggling with this problem, try looking at Feedonomics, which lets you easily export Shopify child variations to Google Shopping, and then feed to the various engines.
What’s nice about this Shopify Google Shopping solution is that your child-level data like price and inventory can also be fed, meaning you’re always dealing with the most up-to-date data.