Bind a domain to an ip address and do no harm?

Question

Domain Name System

Friends, there is a stupid question.
There is a domain, there is a hosting on which the site rotates.

There is a Mikrotik router in the office with Internet on a white IP.
Is it possible to somehow associate a domain with a given IP for RDP, VPN, and so on without harming the hosted site?
Or an association of a 3rd level domain like vpn.domen.ru

Thank you!

Answer 1

subdomain will save the world!
vpn.домен.ру

Answer 2

make a record for subdomain

Answer 3

You need to make a CNAME record at the domain registrar,
but not A.
And everything will be fine.
At least shut up. Does not affect PTR. I wrote to my provider to make a static PTR record. Those bind to ip, To be sure. And sometimes, instead of a domain, it flew to a subdomain.