Adding multiple domains in active directory

I have installed Ad Domain services and created a root domain with dcpromo.exe. i would like to do 2 things now.

1. I would like to create child domains inside that root domain.
2. I would like to create a new domain along with root domain.

I got lot of indo about creating a child domain on google but when i open dcpromo.exe it doesn't show me "Advance Installation" option.

Solution 1:

You need to create additional domain controllers. Each domain needs its own Domain Controller, you cannot create multiple domains using the same domain controller.

I would like to create a new domain along with root domain.

This also requires a new domain controller. In addition, this can be configured as a new forest, or as a child domain with another name ("new domain tree root")

Also, keep in mind, that nowadays Microsoft recommends to not create child domains and stuff like that anymore, but to have one domain with several OU's as business units.