How can I assign a premium plan to different site in my Wix account?
To assign your premium plan to another Wix site: Sign in to your Wix account > hover over Subscriptions > click Premium Plans > under the relevant plan, click Transfer > select the new site > click OK.
If you have already unassigned your premium plan from one of your sites, click Assign, rather than Transfer.
Make sure to assign your domain to your updated site. After transferring your plan, under Manage Premium, click Domains > next to the relevant domain, click Manage.
Under Domain Connects To, click Change > select the relevant site > click Save.