On the domain controller, create a group of users.
Members of this group will be configured as administrators of every computer in the domain.
On the domain controller, open the group policy management tool.
Create a new group policy.
Enter a name for the new group policy.
In our example, the new GPO was named: LOCAL ADMINISTRATORS.
On the Group Policy Management screen, expand the folder named Group Policy Objects.
Right-click your new Group Policy Object and select the Edit option.
On the group policy editor screen, expand the Computer configuration folder and locate the following item.
Right-click on restricted groups and select the option to add a group.
Enter the desired group name.
On the bottom part of the screen, click on the Add button.
Enter the local administrator group name.
In our example, members os the Active Directory group named LOCAL-ADMINS will be automatically configured as members of the local administrator group.
To save the group policy configuration, you need to close the Group Policy editor.
Congratulations! You have finished the GPO creation.