Creating parent containers manually
Some organizations prefer to create and manage Active Directory objects manually to ensure tight control over the objects and their related attributes. For example, you might want to manually create separate Zones or Licenses parent containers for different business units or geographic locations so that you can manually set different sets of permissions and related properties on those containers. Creating objects manually also enables you to have precise control over who has access to the objects.
You can create the container objects anywhere in the forest’s directory structure, but you must have at least one parent Zones container object and at least one parent Licenses container object.