<My 2 cents inline>
Hope it helps...........
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Good Plan so far.
So you are creating an empty root? Is it already created?
Then when I had tested that everything works, and my XP
If you add the DC to the domain, the information get replicated
automatically. You don't need to do anything. If you mean move the users to
the root domain, then you would us ADMT to move them.
It sounds like you want to move to the root domain. If this is the case,
you can use ADMT.
If you plan to leave the users in the second domain, you won't need to do
anything, if you plan to move them you can move them with ADMT. Its also
possible to move them with ADMT without doing the upgrade first.
You can also just upgrade. There are several reason to do a migration
instead of an upgrade. You get a chance to clean up a bad environment. If
you have a small environment that is stable and doesn't have a lot of
"junk", and upgrade would work just fine.