how to create child domain

Hi, can anyone tells me how to create child domain?  I have create domain called CST.NYCCT.  Right now I want to create a child domain.  When Network Creadentials screen pop-up.  What user name, password and domain I should enter?  Do I need to do anything with my main domain?

Thanks!
ioclaudiaAsked:
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cfairleyConnect With a Mentor Commented:
Basically, you will have to run dcpromo on a new server to create it as a domain controller in a new domain.  You will have to use the Enterprise Admin accout to do this.  Here is only article I found.

http://www.winnetmag.com/Articles/Print.cfm?ArticleID=38998
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