Hi!
I am Dana and I work for the Editor X Product team.
Unfortunately we currently do not support migration from a Wix Editor to Editor X.
We are definitely planning to support this so stay tuned!
Hi Dana!! and we can migrate the domain or the premiun plan to develop a new webside on Editor X and replace the one that we have on the editor?
Yes you can.
You can follow the simple instructions here:
Assigning premium plan: https://support.wix.com/en/article/assigning-a-premium-plan-to-a-different-site-in-your-wix-account
Assigning a domain: https://support.wix.com/en/article/assigning-a-domain-to-your-wix-site
Of course it is better to assign the premium plan & domain to the new site only when the new site is ready for production.