It is annoying that there isn’t a command line for the Group Policy Editor. To edit a GPO you must 1) open the Group Policy Management Console, 2) Open the list of Group Policies, 3) select the GPO you want to edit then 4) launch the editor – I right click and select ‘edit’.
A quick Google search led me to an article, with an interesting way to launch the editor discovered by looking at the command line of the task manager. My script, Edit-GPO.ps1, opens an input box to specify the GPO. The box accepts the GUID or the DisplayName. You can type ‘list’ go open a list of all available GPOs in Out-Gridview. Naturally, this PowerShell script requires the GroupPolicy module.