I hope you mean linking the multimeter in series with the battery and measuring the current draw (amps) with the meter in the amps position.
DO NOT leave it in circuit when starting your car a it will simply melt it. Most multimeters can't handle more than 10 amps.
Voltage is measure by putting a multimeter in parallel.
yes, certainally wouldn't try and start the car with the multimeter in situ
didn't want to give u a heart attack when u read that, lol