|To filter using security groups|
In the Group Policy Management Console (GPMC) console tree, expand Group Policy Objects and click the Group Policy object (GPO) to which you want to apply security filtering.
In the results pane, on the Scope tab, click Add.
In the Enter the object name to select box, type the name of the group, user, or computer that you want to add to the security filter. Click OK.
In order to ensure that only members of the group or groups you added in Step 3 can receive the settings in this GPO, you will need to remove Authenticated Users if this group appears in the Scope tab. Click the Scope tab, select this group, and then click Remove.
You must have Edit settings, delete, and modify security permissions on the GPO to perform these procedures.
The settings in a GPO will apply only to users and computers that are contained in the domain, organizational unit, or organizational units to which the GPO is linked, and that are specified in or are members of a group that are specified in Security Filtering.