Copy World Transform Hierarchy (Unity Editor Tool)

WorldTransformCopier.cs

using UnityEditor;
using UnityEngine;

public class WorldTransformCopier : MonoBehaviour
{
    [MenuItem("Auto/Copy World Transform Hierarchy %#c")]
    static void CopyHierarchy()
    {
        if (Selection.gameObjects.Length != 2)
        {
            Debug.LogError("Select exactly TWO GameObjects: first the source, then the target.");
            return;
        }

        Transform source = Selection.gameObjects[0].transform;
        Transform target = Selection.gameObjects[1].transform;

        CopyWorldTransformRecursive(source, target);
        Debug.Log("Copied WORLD transform hierarchy.");
    }

    static void CopyWorldTransformRecursive(Transform source, Transform target)
    {
        target.SetPositionAndRotation(source.position, source.rotation);

        for (int i = 0; i < Mathf.Min(source.childCount, target.childCount); i++)
        {
            CopyWorldTransformRecursive(source.GetChild(i), target.GetChild(i));
        }
    }
}

Copy World Transform Hierarchy (Unity Editor Tool)
A simple Unity Editor script that copies the world position, rotation from one GameObject hierarchy to another with the same structure. Useful for syncing poses or placements between matching rigs or prefab instances.