1. Login to SolidCP.
2. Click Domains under the System category.
3. Click the Add Domain button.
4. Click the Subdomain button.
5. In the next screen, type the subdomain prefix in text box and select domain name from the drop-down menu. Now, if you want to create a website in IIS for this subdomain, keep the Create Web Site checkbox checked, and click on Add Domain button. We do not recommend to select "Enable DNS" for subdomains, as wildcard * record is automatically added on main domain while you add it.