Multiple NT Domains Upgraded to AD - Possible to make childs?

We currently have one "master" domain that we have 95% of our users under.. We upgraded this domain to AD from an NT domain..

We also have a Training domain and a Human Resources domain that were NT domains that have been upgraded to AD as well.. Problem is, they are totally separate from our main domain and I want them to be child domains / under the same forest..

Is this possible at all or will I totally have to scrap the HR and Training domains and create them as new child domains under our Master domain? Thus have to create all new users, create computer accounts, change permissions, etc , etc, huge PITA..

Thanks!
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TBIRD2340Asked:
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Chris DentPowerShell DeveloperCommented:

Hey,

I'm afraid you can't join them to an existing forest if they were created separately. Your only choice would be to create new child domains and migrate everyone into those (ADMT would work for that).

You might consider if it is actually necessary to have those in separate domains. The security boundary is the forest, not individual domains within. For HR at least I would consider folding them into the existing forest root domain.

Chris
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TBIRD2340Author Commented:
I'm not sure I understand...

I would create child domains for HR and Training UNDER our master domain and then run the ADMT tool against those to get everything over to the new child domains?

The part that really confused me was this: "You might consider if it is actually necessary to have those in separate domains. The security boundary is the forest, not individual domains within. For HR at least I would consider folding them into the existing forest root domain."

Thanks for your help..
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Chris DentPowerShell DeveloperCommented:

> I would create child domains for HR and Training UNDER our master domain and then run the ADMT tool
> against those to get everything over to the new child domains?

Yep.

> The part that really confused me was this

It translates to why do you want to have separate child domains?

It is cheaper, both in terms of servers and administration to have everyone in a single domain. What are you looking to maintain by moving them into child domains?

If you have good reason for it then no problem, it's just worth thinking about.

Chris
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