Windows 2008 R2 forest

I currently have a Dell server running as a domain controller for Company A.  I have a second Dell server running Windows 2008 R2 that I bought from another place.  Company A also runs Company B.

I'd like to have each server run a separate company, yet have both networks connected.  I know that this gets me into creating a forest, but do not know how to do that.

Any Help would be appreciated.
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Chad FranksSenior System EngineerCommented:
this site tells you step by step on how to do this:

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The Windows 2008 instructions are here:

Since Company A runs Company B, will Company B be a sub domain?  if so, you can have both domains on both domain controllers and have redundancy.
jhillbosAuthor Commented:
Thanks very much for the great links!
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