TransformTools.cs

using UnityEngine;
using UnityEditor;

public static class ResetSelectedTransforms
{
	[MenuItem("Utilities/Reset Selected Transforms &z", true)]
	static bool ValidateResetSelectedTransforms() { return Selection.activeTransform != null; }

 	/* Use option-z or alt-z to zero out the position and rotation and set the scale to 1 for
 	   the selected transforms. */
	[MenuItem("Utilities/Reset Selected Transforms &z")]
	static void ResetSelectedTransorms() {
		Undo.RecordObjects(Selection.gameObjects, "Reset Transforms of Selected Objects");

		foreach (var selected in Selection.gameObjects) {
			var transform = selected.transform;
			transform.localPosition = Vector3.zero;
			transform.localRotation = Quaternion.identity;
			transform.localScale = Vector3.one;
		}
	}

	[MenuItem("Utilities/Parent Selected in New GameObject &p", true)]
	static bool ValidateParentSelectedInNewGameObject() { return Selection.activeTransform != null; }

	/* Use option-p to reparent selected objects in a new empty game object at the same level in the
	   hierarchy. */
	[MenuItem("Utilities/Parent Selected in New GameObject &p")]
	public static void ParentSelectedInNewGameObject() {
		var selectedObjs = Selection.gameObjects;
		if (selectedObjs.Length == 0) {
			Debug.LogError("You must select objects to reparent.");
			return;
		}

		var parent = selectedObjs[0].transform.parent;

		foreach (var obj in selectedObjs) {
			if (obj.transform.parent != parent) {
				Debug.LogError("All selected objects must have the same parent.");
				return;
			}
		}

		Undo.RecordObjects(Selection.gameObjects, "Reparent Selected Objects");

		var siblingIndex = selectedObjs[0].transform.GetSiblingIndex();

		var newParent = new GameObject().transform;
		newParent.position = Vector3.zero;
		newParent.SetParent(parent, false);
		newParent.SetSiblingIndex(siblingIndex);

		foreach (var selected in Selection.gameObjects) {
			selected.transform.SetParent(newParent, true);
		}
	}
}