Hi RickMitterer,
Thanks for asking a question. I'm more than happy to assist you today. Server aliases are set up in the Apache configuration file. cPanel does not give you access to that specific file. However, when you set up a parked domain, it creates a server alias. If you provide us a bit more details in what you are trying to accomplish, we can direct you on how to do so appropriately.
I hope this helps! If you need further assistance please feel free to contact us.
Thanks!
Tim S