How do I copy my cart or checkout page layout to my other store?

Export the template from one store and import it in the other. This works on Cart Templates, Checkout Templates, Product Templates, Shop Templates, Category Templates and both blog template pages, all under Settings → Appearance.

1. In the first store, open the template page and click Export on your template. A JSON file downloads.
2. Open your profile menu and pick the other store under Switch store.
3. Open the same template page and click Import JSON, then choose the file.
4. The template appears under My templates. Click Activate to use it.

Import into the same template page you exported from. If the file has blocks that page type doesn't support, the import fails.