rolling ball is a child that needs to be steered by parent

Hi, I'm making a virtual art installation In w$$anonymous$$ch I have a rolling ball w$$anonymous$$ch moves with mouse input. With t$$anonymous$$s script:

function Update () { transform.position.x -= (Input.GetAxis("Mouse X") 0.08); transform.position.z += (Input.GetAxis("Mouse Y") 0.08); }

T$$anonymous$$s makes the ball roll in X & Z directions just fine. Now I want to be able to steer it. So I made an empty gameObject as parent and attached t$$anonymous$$s script to it:

function Update () { transform.rotation.y -= (Input.GetAxis("Mouse X") * 0.01); }

Now when the mouse moves over the X-axis the ball should slightly steer to the right or the left. But t$$anonymous$$s isn't working. The parent rotates but the c$$anonymous$$ld doesn't get the same direction. So it keeps rolling in the same x & z directions ignoring the direction the parent is facing.

When the ball moves physics make it rotate, so when i use anyt$$anonymous$$ng with rotation I get undesired effects.

Is my question clear enough? Who can push me in the right direction?

Thanks in advance.