EditorUtility.ResetToPrefabState

Resets the properties of the component or game object to the parent prefab state

All overrides will be cleared. However the transform.position and rotation of a root game object in a prefab instance will never be cleared.

// Try to set the selected GameObject to a prefab state

class EditorUtilityResetToPrefabState extends ScriptableObject {

@MenuItem("Examples/Attempt to reset to prefab %r")
static function Reset() {
if(EditorUtility.ResetToPrefabState(Selection.activeGameObject))
Debug.Log("Reseted to prefab state successfully!");
else
Debug.LogError("Couldnt reset to a prefab state " + Selection.activeGameObject.name);
}
@MenuItem("Examples/Attemp to reset to prefab %r", true)
static function CheckReset() {
return Selection.activeGameObject != null;
}
}