How to make G72 cycle for face

Hey guy first i give u example
Suppose we want to face round bar dia of 100mm

What we do write the program
G72 W1 R0.5
G72 P10 Q20 W0.1 F0.3

Meaning G72 is facing cycle

W1- Depth of cut z axis means 1 mm  material will be remove every pass

R0.5- Retract to starting position means after every pass tool come +0.5 in z axis and come  to starting position

Next line

P10 - Starting block

Q20- Ending block

W0.1- This means after cycle finish only 0.1 mm material balance for finish pass

F0.3- Feed

Eg-  N1 TO1O1
        G54
        G99 S1000 M3
        G0 X101 Z50
        G0 X101 Z2 ( STARTING POSITION )
        G72 W1 R0.5
        G72 P10 Q20 W0.1 F0.3
      N10 G0 Z0 ( This is our final value Z0)
       N20 G01 X0( Ending block )
       G0 Z100
       M5    (spindle stop)
       M30(end of block)