how to make tank aiming

ok so im trying to make a tank TPS and i have done the movement stuff and the camera stuff i learn from fps shooter. the problem is in fps your body and head move together, what i want is that my tank head can rotate when i move the camera with my mouse while the body rotate with A and D key.

put camera under the tank turret and then make a while loop( while mouse is pressed do rotate left if ā€œaā€ is pressed and if ā€œdā€ is pressed rotate right. You can do that with rb.transform.rotate(x,y,z) which rb means your rigidbody