Putting the Flair in Your flair.website.com.
Special prefixes for websites are an excellent way to split your traffic up by category on your website, but you will need to make modifications to your domain name server.
To take advantage of this feature, you'll have to register the prefix (such as name.websiteurl.com) with your name server. Once your name server propagates the information to other name servers your new prefix will be accessible.
Why Reinvent The Wheel?
Don¡¯t bother! It's definitely interesting to learn how to set up a name server but, unless you are setting up your own hosting, it's an exercise without merit.
Anywhere you register your domain name or choose to host your website will have their own domain name server setup. In rare cases, where you hold thousands of domains and need to have a specialized setup between them, you may want to learn. Otherwise, it's best to leave it to the professionals.