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Y-axis parting from Sandvik will let you “reach” between the main and sub.
I use Royal qc65 collet noses so might not have to reach as far as you but I part with just enough space between m/s to fit...

I see that in the book, so would it look like this?
#5222=0.000
#5242=1.000
#5262=2.000
G54
G65 P1111 L1
G55
G65 P1111 L1
G56
G65 P1111 L1

8
I assume by system variables you mean
G65 P1111 L1 A0.500 B1.5
Then in Sub program "X#1" and "Z#2"

I find it easy to dial in a program just like any other part.. And then use G10 to move in...

No L is how many times to loop thru the subprogram. That would be used when using a bar puller/feeder and you want to loop intil you get to the end of the bar.

The P0 is telling it which...

This can be done, I use a "Main Program" (it controls the offset) and a "Sub Program" (it controls the tool path)

O2120 (MAIN PROGRAM)
G10 P0 X0.0 Z0.0 [SETS WORK OFFSET TO ZERO]
G65 P2121...