To transfer a domain or several domains from one user account to another:
Parallels Plesk Panel will check if the destination client account can provide the appropriate amount of resources for the transferred domains to function properly. If the destination client account does not have the resources to accommodate the new domains, the lacking resources will be highlighted. To allocate the required amount of resources to the destination client account, go to Clients > client name > Resource Usage, adjust the amount of resources available to the user accordingly, and start the domain transfer procedure again.
You can also choose IP addresses for transferred domains by selecting the destination IP address from the New IP address menu corresponding to the required domain.