We want to configure a hosting plan (plesk domain) which includes a single .de domain. But the customer should be able to buy additional domains of any TLD we offer and use it as an alias for this hosting. In the configuration for the plesk domain hosting plan I can define one domain registration hosting plan. If I limit this to .de registration only, the customer would not be able to add other TLD domains to this hosting. If I configure the domain registration plan for all TLDs, the customer will be able to choose any TLD as inclusive domain. Any suggestions how to build this?