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How to create a domain/subdomain with www prefix?
There is no need to create a separate domain/subdomain with www prefix.
By default, Plesk creates a CNAME DNS record with www prefix for each domain. So, each website created in Plesk can be accessible over www from the start.
If you want a domain to be always loaded with www prefix, select www.example.com as a preferred domain in Plesk at Domains > example.com > Hosting Settings.