How do create a grenade launches?

Heres the script :

 var Grenade : Transform;
 
 if (Input.GetMouseButtonDown(1))
 {
   var launch = Instantiate (Grenade, gameObject.Find("GrenadeSpawn").transform.position.axis.y, Quaternion.identity);
   bulletfire.rigidbody.AddForce(transform.forward * 1000);
 }

The thing is how do i make the grenade launchs from position Y to Z ?

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Still dont get it?

means : When the player fires the grenade launches from player to plane.