After you establish the root domain, you can add a new tree to the existing forest if your network plan requires multiple trees.
To create a new tree in an existing forest, run Dcpromo.exe to start the Active Directory Installation wizard. Complete the wizard by using the information in the following table.
| On this wizard page | Do this |
|---|---|
| Domain Controller Type | Click Domain controller for a new domain. |
| Create Tree or Child Domain | Click Create a new domain tree. |
| Create or Join Forest | Click Place this new domain tree in an existing forest. |
| Network Credentials | Specify the user name, password, and domain name of a user account in the Enterprise Admins group, which exists in the root domain of the forest. |
| New Domain Tree | Specify the DNS name for the new tree. |
| Domain NetBIOS Name | Specify the NetBIOS name for the new domain. |
| Database and Log Locations | Specify locations for the Active Directory database and log files. |
| Shared System Volume | Specify the location for the shared system volume. |
| Windows NT 4.0 RAS Servers | Specify whether to weaken permissions to support users who access the network through remote access servers running Windows NT 4.0. |
After you finish specifying the installation information, the Active Directory Installation wizard installs Active Directory, converts the computer to a domain controller, and adds the Active Directory consoles to the Administrative Tools menu on that computer.