How do you correctly cut suspension springs on car?

It was an old way to lower cars, you'd have to cut a coil off the bottom so that the spring end is in the same place in the spring perch( hacksaw or cut off wheel-NO

torching). For safety reason it is not recommended, since the spring rate is the same, the chance of bottoming out is high. The spring also might have softened up due to age/usage. Most cars have aftermarket spring available that increase the rate to prevent this, this is the route I'd recommend.