hi binish, as i mentioned in this thread, netlify is NOT a domain name registrar, never has, never will be. You are able to purchase a domain through our interface, but the actual transaction happens with name.com who is a domain name registrar.
more details here:
You are able to use netlify DNS to manage your domain after the fact, but if you are moving off netlify and onto a different hosting service, you are no longer able to use netlify dns to point to your domain, as we do not offer DNS services for people who are not hosting sites with us.
As i mentioned in your other thread, you should speak to wix support for guidance.
we can continue conversation in the other thread if you have further questions, but the answer will likely continue to be that you need to contact wix support if you are moving your site to wix and want wix to be your DNS.