How to Add a Domain to an Existing Forest

Log in to the domain computer you are adding to the forest. Click on 'Start,' open 'Run,' type 'dcpromo' and then press 'Enter.'
Click 'Next,' select the 'Domain controller for a new domain' option, click 'Next,' click 'Child domain in an existing domain tree' and then click on the 'Next' button again.
Type in your administrative network credentials, click 'Next' three times, click 'Browse,' choose where you want to store the database and log folders for the forest and then click on the 'Next' button.
Click 'Browse' and select the 'SysVol' folder for the domain computer, click 'Next' two times, select what type of permissions you want to give the new domain server, type in what password you want to use for the domain server, click 'Next' two times and restart the computer. The computer is now added to the existing forest on your network.
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