RemoveChildInAsset

gistfile1.cs

public static void RemoveChildInAsset (GameObject child)
{
	GameObject prefab = PrefabUtility.FindPrefabRoot (child);
	RemoveChildInAsset (prefab, child);
}
public static void RemoveChildInAsset (GameObject prefab, GameObject child)
{
	try {
		string oldName = child.name;
		child.name = System.Guid.NewGuid ().ToString ();
		GameObject instance = (GameObject)PrefabUtility.InstantiatePrefab (prefab);
		GameObject oldChild = instance.transform.FindChild (child.name).gameObject;
		GameObject.DestroyImmediate (oldChild);
		PrefabUtility.ReplacePrefab (instance, prefab, ReplacePrefabOptions.ConnectToPrefab);
		prefab.MakeDirty ();
		AssetDatabase.SaveAssets ();
		AssetDatabase.Refresh ();
		GameObject.DestroyImmediate (instance);
		Debug.Log ("Child Removed in Asset: " + oldName);
	} catch (System.Exception ex) {
		Debug.Log ("Could not remove child in Asset: " + ex.ToString());
	}
}