How do you change a 240V dedicated circuit for an electric stove to a 120V dedicated circuit for a gas stove?

For USA, Canada and countries running a 60 Hz supply service.It is best to install a new 120 volt branch circuit for the gas stove using properly sized cable and breaker and the correct type of GFCI-protected 120 volt socket outlet for use in a kitchen area.

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As the existing wire size is sufficient to handle 220 volts you can use it to carry 110 volts. You will need to change the receptacle and also change from a double pole breaker to a single pole breaker at the fuse panel. Unless you know what you are doing, I would suggest you hire an electrician. A very simple job that should not be too expensive.

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I would do nothing more than trip the breaker at the fuse panel. Out of sight out of mind.

[That is not good practice! Why not provide a properly connected and protected 120 volt socket outlet near to the gas stove?]

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You'll want to perform what is known as a "burial".

Carefully remove the wires from the main service panel and tuck them away OUTSIDE the panel. Before tucking them away snip off the bare ends, put on a wire-nut, and wrap it with electrical tape. At the kitchen outlet, snip off the bare ends and put wirenut on and tape. But leave everything INSIDE the junction box.

This method allows for the unit to be hooked back up if need be.

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As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.

Before you do any work yourself,

on electrical circuits, equipment or appliances,

always use a test meter to ensure the circuit is, in fact, de-energized.

IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB

SAFELY AND COMPETENTLY

REFER THIS WORK TO QUALIFIED PROFESSIONALS.