How to: CName to Subdomain Levels
Domains are mapped to both a host name -- a text string -- and an Internet protocol address. Canonical names create an alias for a domain or subdomain; rather than directing a domain to a specific IP address -- as in the case of A registers -- CNAMEs link a new host name to a "true" host name. For example, b.example.com and c.example.com could both be aliases for a.example.com. CNAMEs enable b.example.com and c.example.com to redirect to a.example.com, but still use their own independent host names. Thus, when a visitor goes to b.example.com, they'll be redirected to a.example.com, but the address bar won't change. You can assign new aliases to subdomains in cPanel.
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Instructions
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Log into cPanel through example.com/cpanel -- "example.com" being the domain name for your website -- or through your Web host's login portal.
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Browse to Domain, then click "Simple DNS Zone Editor." Enter the destination address -- the target subdomain -- into the Name field.
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Enter the source address -- the subdomain that should share the host and IP address of the target subdomain -- into the CNAME field.
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Click "Add CNAME Record" to create an alias for the target subdomain.
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