A parked domain is a domain name that sits on top of another, serving the same website to a client's browser. They're commonly used when website owners have the same domain on multiple top-level domains, such as with demo1234.com and demo1234.org.
1) Typically, a parked domain is added from cPanel, but let's see how to add one in WHM. Find the DNS Functions section.

2) Click Park a Domain.

3) Choose the existing domain on which to park the new one.

4) Enter the domain name to park.

5) Click Submit.
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Success! One domain name was successfully parked on top of another. The owner of the original domain should now be able to see the parked domain in cPanel.

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This is the end of the tutorial. You now know how to park a domain in WHM.