1: From the control panel, click on the "Subdomains" icon in the main control panel menu.
2: Add the name of the Sub domain that you want to create to the "Add Subdomain:" box.
3: Click "Create"
Note: It may take up to five minutes for a new subdomain to become active. Each subdomain appears in public_html/subdomain-name. This means that your subdomain can also be accessed at http://www.yoursite.com/subdomain-name.
You can upload to a subdomain folder in the same way you upload to any
other folder: use FTP, MS FrontPage, File Manager, etc.