: Do I need to add subdomain sitemap / robots.txt separately? Say I have a domain example.com And it has a subdomain sub.example.com And another subdomain internal.example.com I have some links

@Kristi941

Here is link to Google's documentation about the validity of URLs robots.txt as per its location.

Do you have any links from the main domain or the other sub-domain to internal.domain.com?

If not then Google, in general, would not see your sub-domain on its own.
I would still recommend to block it via the robots.txt file if they have never been exposed in past. If, by any chance URLs from internal.example.com have been exposed to Google then use Robots-Meta Tag to declare these pages non-indexable and no-follow.

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