Child ignoring Parent's movment

Hello Folks, I have imported a 3D object into unity. and I have applied a rotation script on it.

using this

**myfridge.transform.Rotate(new Vector3(1f,1f,1f)Time.deltaTime/13, 70);*

now I also want this object to move diagonally across the scene. Since the moment script was getting messed up by the rotation,i thought of a work around. i created an empty game object and applied the moment on it. Edit: here is my movment code

void Update () {

     dir = new Vector3(0, 1, -1);  
     dir = transform.TransformDirection(dir) * speed*30;
     
 }
 void FixedUpdate()
 {
     
      controller2.Move(dir * Time.deltaTime);
 }

Now when i make my original object(with rotation) the child of the game object,it doesn't follow the parent,instead it stays there rotating on the same place.

any help ?