This article explains how to add a subdomain to your hosting control panel.
This article applies to Shared Hosting, Reseller accounts and Dedicated Servers.
Login to your Donhost control panel.
Click the Domains link on the navigation bar.
Click the Add Domain link
Select the Subdomain radio button and enter the desired domain name into the Domain field without the www prefix.
Choose the appropriate hosting account to map the subdomain to from Map To list.
Click Next to add the subdomain.
Please note: If you are adding a subdomain, it must be of a domain name already active on your account.