In your panel docreate yoursite.com
- then go ahead and create a subdomain for yoursite.com, like cars.yoursite.com
After creation go to your DNS settings click edit records and change the IP number of yoursite.com don't change cars.yoursite.com.
When done correctly CWP will host only cars.yoursite.com and all other traffic will be send to the other server where yoursite.com is hosted. In the home directory of yoursite.com on the cwp server you could replace the standard index.html with one who who redirects to yoursite.com on the other server.
When creating the subdomain pay attention to the folder it shows, correct the folder name by adding the name of the subdomain to it, like so: public_html/cars
In that folder you put everything you want for the subdomain and will the system direct users to the right folder.