Subdomains are a great way to create shortened web addresses, for example:
You can create as many subdomains as you like in the control panel, they are generated in real time.
When creating the subdomain all you have to do is create a folder in your web space, which you can do via ftp, then go to the subdomains section in the control panel
and you will be able to map a subdomain onto the directory you have created. You should create the directory you want to map it to first.
If you run into any difficulties just contact the live support, who will be able to assist you further.