Sorry if a duplicate - I’m usually involved with the Q boards, but know you folks would want this. Here ya go...

https://imgoat.com/uploads/d686fd640b/192626.png

https://imgoat.com/uploads/d686fd640b/192627.png

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UPDATE - There seems to be some questions about whether you have to own the domain to create sub domains. I found this for you all to peruse, and interpret:

IF I OWN A DOMAIN, DO I OWN ALL OF IT'S SUBDOMAINS? https://serverfault.com/questions/537310/if-i-own-a-domain-do-i-own-all-of-its-sub-domains