NT to 2003 Upgrade

I'm planning on doing a NT to 2003 upgrade but I want to test it first.  So, I was going to create a new NT4 BDC and replicate it with the PDC.  Then remove the new BDC from the live production enviroment so its effectivley in a test lab and test the 2003 upgrade process.

My question is when I remove my new BDC from the production enviroment how do I force it to be a PDC ?

I dont want to modify the live enviroment at this stage.

So, my goal is to have my live enviroment safe with a PDC and a BDC and my test lab with a BDC thats promoted to a PDC so I can run the 2003 upgrade as a test.
Who is Participating?
For a test environment, you're probably best of with Virtual Server (free now). Backups and restores are reduced to copying "harddisk" files and/or using undo disks.
Microsoft Virtual Server 2005 R2

The promotion itself is done in Server Manager; highlight the BDC, and choose "Promote to Primary Domain Controller".
And some links that might help for the upgrade:

How to prevent overloading on the first domain controller during domain upgrade

How To View and Transfer FSMO Roles in Windows Server 2003

DNS is even more important for AD than WINS is for an NT4 domain:
Frequently Asked Questions About Windows 2000 DNS and Windows Server 2003 DNS

Best practices for DNS client settings in Windows 2000 Server and in Windows Server 2003

And some general links:
Tools and Documentation for Upgrading to Windows Server 2003

Background Information for Upgrading to Windows Server 2003 Active Directory

Migrating Windows NT Server 4.0 Domains to Windows Server 2003 Active Directory
MarionTaylorAuthor Commented:
Thanks oBda I'll get reading.

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