UPDATE 2:
Our website is created on RedHat Linux. We are using Apache as the web server software. Basically, we have our website on a LAMP configuration. We use rackspace managed hosting, but they do not manage our dns records. Our DNS records are managed by verizon, for which I have access too also.
UPDATE 1:
How do I create a sub-domain for our existing domain? If our existing domain was companyname.com, we would want a subdomain like users.companyname.com.
ORIGINAL QUESTION:
I've been given access to our dns records and need to create a sub domain. We currently have
companyname.com and www.companyname.com go to our web host at say 00.000.000.00
How do I create a new dns record so we can point users.companyname.com to a folder on our server at 00.000.000.00 instead of it going to the webroot of 00.000.000.00?