You can use the Delegation of Control Wizard to delegate administrative control of a particular domain or organizational ...

You can use the Delegation of Control Wizard to delegate administrative control of a particular domain or organizational unit (OU) to groups or individuals who are responsible for only that domain or OU. By delegating administration, you can allow groups or individuals in your organization to perform tasks such as user, computer, and security group management, password resets, Group Policy management, and replication topology and schedule setting. You can also help secure your network from accidental or malicious damage by limiting the capabilities of the groups or individuals to whom you delegate control.