How to make subdomain?

Domain name. Somewhere spinning website. Has control of his dns records (I can get lost in the terminology).
There is office network with white ip Internet facing, behind a router, you want one machine on Linux to make a subdomain some.site.ru, i.e. for the grid and for remote clients.

How is this done? In the direction of A record to look at?
October 8th 19 at 02:15
2 answers
October 8th 19 at 02:17
Yes, add a record, name = waste, address = desired IPS.
October 8th 19 at 02:19
The router in the intranet port 80 to traverse don't forget!

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