The sub domain name is the third or lower level domain name that points to a sub folder for the domain. For example the sub domain 'http://mysub.domain.com' will point to 'http://domain.com/mysub'. The sub domain will treat the sub folder as its root directory. Creating a subdomain through the Helm Control Panel is easily accomplished.

Step 1: Log in to the Control Panel for your Server as Admin.

Step 2: Click on the Domains icon.

Step 3: Click on the Domain which you like to create the sub domain for.

Step 4: Click the icon which says Sub Domains.

Step 5: As you can see, this domain currently has no sub domains. Click Add New.

Step 6: Type a header name for the sub domain. Click Save.

You will now see the sub domain has been created. Helm will automatically create a folder under the main domain in IIS with the same of the sub domain. This is where the files for this site will need to be installed under.