We create alternate templates for each custom Builder page, as described in this Shopify blog post. It’s important to ensure that you don’t remove those template files, so if you plan to switch themes make sure to copy those templates over to the new theme.
- Download your current Shopify theme
- Grab all the files matching
*/*.builder.liquid - Copy those files into the code file you’re about to push.
- Zip the file and push!