which software re you using? Webcontrol? there are arrows, a line number, and z buttons. The line number will take you to a specific line.
the arrows will move you line by line through the gcode.
The z buttons will move you to the next z-axis lift
Be careful using these because you run the risk of dragging the plunged bit across your work and if your gcode starts and stops your spindle, then it may not start for you in the middle of your gcode file. Ideally, you might try positioning the sled near where you think it should be and then go from the closest z axis plunge so the cut will continue from that point.
If you are using Makerverse, you will likely need to edit your gcode file by keeping the header, but removing all the sections already cut, and then starting it.