Here is an example with screen shots.
in this example it stops cutting for some reason.
you repair the problem and need to pickup where it stopped cutting.
here that is the top right of the W.
We select that area and are given 2 options below as it jumps to that line of code. (Line 1494 in this case)
SELECTING LOOP will load a new program from the last pierce.
SELECTING LINE will load a new program from that line which will include a new Pierce location
