Welcome to the Q&A Forum

Hi Ramendra, To my knowledge, you can only provide directives in the robots.txt file for the domain on which it lives. This goes for both http/https and www/non-www versions of domains. This is why it's important to handle all preferred domain formatting with redirects, that point to your canonicalized version. So if you want http://www to index, all other versions redirect to that. There might be a work around of some sort, but honestly, what I described above with redirection towards preferred versions is the direction you should take. Then you can manage one robots.txt file and your indexing will align with what you want better.