If you need to point a sub-domain to another server you should not use the sub-domains icon. Instead you want to use the DNS Zone Editor to add an A record to the appropriate IP address.
For example if you were trying to create the sub-domain support.example.com
Log into your HELM control panel.
Click on the Domains icon.
Click the domain for which you would like to view the DNS Zones.
Click the DNS Zone Editor icon.
You should now see a list of all the DNS Zones for your domain. Click Add New.
Now you need to add the DNS record. In this case the fields would look like this:
- Record Type: A (Host Record)
- Record Name: support
- Record Data: IP Address
- Record Preference: 0 (Leave this zero as it applies to MX records only)
That will point support.yourdomain.com to the IP address you specify.
From there you need to set up the server you pointed it to, to answer requests for support.example.com.