When you press Reset, this restarts the gcode from the beginning, you are already at the location you left off from, so you can right click on the white cross-hairs and click Run From Here to begin where you left off.
If for some reason you lost position, and cannot locate your original Program Zero, then you can get it close and use the Run From Here to a corner of a part that you already cut and see how close the torch is to this position when it moves over, measure how far you are off. Go back to Program Zero and use the Increment feature to move the torch the distance you were of, reset your Program Zero and Run From Here again to check again if you are back in sinc with the coordinates and Run From Here start up where you left off.