Multi-domain site with different robots and sitemap?

Question

robots.txt

There is a site, for example, its name is company.rf.
Now it is planned to divide the site into regions, so that each has its own phone number and subdomain.
Each subdomain will have city.company.rf, its own sitemap, and its own robots.
I want to use the common "stuffing" of the engine, to separate the rest of the files.
That is, so that all the files necessary for the operation of the site are taken from a shared folder.
Did each sitemap and robots have separate ones?
PS: I found the first solution for robots https://drupal.ru/node/46111

Answer 1

I found the first solution for robots https://drupal.ru/node/46111
Well, actually, the solution to the second question comes from the first one.
Sitemap can be fed through robots.