If you no longer want to associate a custom domain from a third-party provider with your Shopify store, then you can remove it from your Shopify admin, or transfer it to another Shopify store or domain provider. You can also remove subdomains.
.myshopify.com domain name can't be removed or transferred because you use your original
.myshopify.com domain name to log in to your Shopify admin and identify your account when you contact Shopify Support.
You can change your
.myshopify.com domain name one time. However, you still need to use your original
.myshopify.com domain name to log in to your Shopify admin and to contact Shopify Support.
If you have a Shopify-managed domain, learn more about transferring it to another Shopify store or other domain provider.