1, first turn on the "Start menu-Control Panel-management tools-Server Manager" item;
2, then in the Server Manager window, click the console tree---Role option on the left, and click the Active Directory Domain service button on the right.
3. Then click the Active Directory Domain Services Installation Wizard (dcpromo. exe) button to start the Installation Wizard and continue clicking the "Next" button;
4, after the pop-up dialog box, click to select the Add domain controller to existing domain item, click Next button;
5, in the dialog box to carry out the installation of the account credentials (such as domain Administrator Lchh), click the OK button, continuous click Next;
6. Set the source of the domain data in the dialog box (using the default "replicate data from existing domain controllers over the network" in this article, we recommend that you do not change it), after referencing the method of installing the child domain, the computer restarts after completion, and the additional domain controller is configured to complete.