How to make a camera locate a part in my car?

I want to make the camera in "DriveScriptAWD"(Local) to locate

Car chassis is the parent of "Parts" and "DriverSeat"

"Parts" is the Parent of "CamFocus". "DriverSeat" is the Parent of "ToolGiver"

"ToolGiver" is the Parent of "DriveGui"

"DriveGUI" is the parent of "DriveScriptAWD"

I can't figure out how to locate "CamFocus" locally.

My script:

cam.CameraSubject = ???

How can I do this?

If I understand you correctly, your Instance hierarchy is as follows:

--Car Chassis
------Parts
----------CamFocus
------DriverSeat
----------ToolGiver
--------------DriveGUI
------------------DriveScriptAWD

So:

cam.CameraSubject = script.Parent.Parent.Parent.Parent.Parts.CamFocus

But it would be better to make references to them so that it's easier to see what is going on:

driveGUI = script.Parent
toolGiver = driveGui.Parent
driverSeat = toolGiver.Parent
chassis = driverSeat.Parent
parts = chassis.Parts
focus = parts.CamFocus

cam.CameraSubject = focus

I hope that answers your question.