DNS - Want a known top level domain as local domain

Let say i have several domains; that i want to combine.

test.microsoft.com, noname.microsoft.com etc. to microsoft.com. So i want a domain, instead of seperate domains.

But the name i would like to have is on the internet already taken. No problem, i will use this only locally.

But i get some DNS problems. My DNS forwards the microsoft.com requests to the internet and i get a internet ip address back. I would like to have my DNS ( 2008 R2 ) to resolve this microsoft.com domain locally.

Now i am looking for DNAMES. But i am not sure, this is the right direction.

Is there a way to do this ?