How do you cross list a product with customizations?

I’m using a template to list products on the US and CA stores. However, the listing works perfectly in the US store. All variations listed under the parent. But in the CA store, there are no parents. Only the variations carry across. So when it comes time to add a customization option to the parent so all the children get it, it’s impossible on the CA store and I’m forced to do them all one by one which will take way too long. Each parent listing has like 50 variations, so this is impossible. I have no idea what to do. The product is displaying perfectly ok in the CA store for customers with all variation options, but there is of course no option to customize it until I add it manually to each and every single variation.