Two Hitboxes, One parent

Hello i am really irritated and want to detect either a headshot hitbox or a body hitbox on my ai, the problem is it either thinks both of them are the body hitbox or both are the head hitbox. i tryed to get around this by using a script on the headshot box when its hit it initates a headshot event that takes away all of the health from the ai. But instead it dosnt work.

     if (Physics.Linecast(previousPos, currentPos, hit, layerMask) && (Time.time-time) > 0.001) 
     {
         switch(hit.transform.tag)
         {
             case "Target":
                 AudioSource.PlayClipAtPoint(TargetSound, Camera.main.transform.position);
                 Instantiate(HoleDecal[0], hit.point + (hit.normal * DecalOffset), Quaternion.LookRotation(hit.normal));
                 Destroy(gameObject);
             break;
             case "Zombie":
                                 Debug.LogError("BODY  SHOT");
                 hit.transform.gameObject.GetComponent(Zombie).Health -= DamageToDeal;
                 Destroy(gameObject);
             break;
             case "Head":
                 Debug.LogError("HEAD SHOT");
                 hit.transform.gameObject.GetComponent(HeadShotDetector).Headshot = true;
                 Destroy(gameObject);
             break;        
         
         }
                    
     }

My heirarchy is as fallows

AI Eyes ViewCone HeadshotBox Model

The headshot box script works fine, i just dont know whether or not its to do with my code or the engine or the setup im trying to run.