How to migrate a single or several domains using Plesk Migration & Transfer Manager?
It is impossible to migrate a single domain or several domains of a subscription. Suggest a new feature at Migrate domain only.
The top-ranked suggestions are likely to be included in the next versions of Plesk.
Only individual subscriptions can be chosen for migration, and they are migrated together with all associated domains.
It is possible to migrate the subscription and after that remove the unnecessary domains in this subscription.
Alternatively, it is possible to migrate a domain using site importing.