How to create Child Domain on Windows Server 2012 R2

In this video demonstration we will look at how to deploy child domain in existing windows server 2012 R2 Forest Infrastructure.
In this example We have an existing Windows Server 2012 R2 root domain name mylab.local and we want to create child domain name usa.mylab.local.
We will also configure site and subnet for the lab environment.

source

windows server