On the Group policy management screen, you need to right-click the Organizational Unit desired and select the option to link an existent GPO.
In our example, we are going to link the group policy named MY-GPO to the root of the domain.
After applying the GPO you need to wait for 10 or 20 minutes.
During this time the GPO will be replicated to other domain controllers.
Reboot a remote computer and verify if the configuration was applied only on the selected user account.
In our example, only the account USER01 will apply the configurations from the GPO named MY-GPO.