After you establish the root domain, you can create additional domains within the tree if your network plan requires multiple domains. Each new domain within the tree will be a child domain of the root domain, or a child domain of another child domain.
For example, you create a domain named europe.contoso.com, which is a child domain of the root domain, contoso.com. The next domain that you create within that tree can be a child of constoso.com or a child of europe.contoso.com.
To create a child domain, 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 child domain in an existing domain tree. |
| 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. |
| Child Domain Installation | Specify the DNS name of the parent domain, and the name of the new child domain. |
| 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.