wordpress permalinks with prefix for wildcard

wordpress permalinks with prefix for wildcard

I'm having trouble trying to program into Wordpress a wildcard for the
permalink structure. So for example, I'm trying to setup a permalink where
the link is like this: foo.example.com/company. At the moment, the
wildcard is in place for the URL (foo.example.com), but the permalinks are
still under the root (example.com/company). Is there a way to program it
so that the permalink will be matched exactly to the URL that is written.
So if I entered in dsdd.example.com, the permalinks will display
dsdd.example.com/company, etcc...
This kind of thing is way over my head, so if someone could provide some
code examples of how to accomplish this, it would be much appreciated.
Thank you.