PrefabUtility.ResetToPrefabState

Description

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.

using UnityEngine;
using UnityEditor;

class Example : EditorWindow
{
    // Try to set the selected GameObject to a prefab state

    [MenuItem("Examples/Attempt to reset to prefab %r")]
    static void Reset()
    {
        if (PrefabUtility.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 bool CheckReset()
    {
        return Selection.activeGameObject != null;
    }
}