CName for subdomain

Hi everyone. This is just a DNS question.

Is it possible to have a cname reference a subdomain? We have a reseller account with a vendor of ours. For our clients to access their web interface they have to go to http://www.vendorurl.com/myname. What iI would like is for http://sub.mydomain.com to output http://www.vendorurl.com/myname, and keep the vendorurl.com domain masked. Is this possible?

Thanks,
Matthew.

 

 

 

 

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