Please excuse my stupid noob question;

I have a client with 2 domains, .COM & .NET. I built the new .NET and now we're ready move the .COM domain from Register.com to my host.

I assumed that I should set up the .COM domain as a Parked/Pointed domain with the existing .NET in my WHM first.

Then I would go to Register.com and change the NameServers to point .COM to the new host where .NET is now.

However, I keep getting "Sorry, a DNS entry for already exists, please delete it first"

If I delete .COM first, won't all the links and Search Engines fail? I'm looking for a seamless transition if that's possible.

Thanks,
Chip