Using NcPlot 2.21 is there documentation on how to setup G66 subprogram?

I am trying to backplot the program the following program to checking for problems.

Thank You

%
O0010
N100 G20
N110 G0 G17 G40 G80 G90 G94 G98
N120 G91 G28 Z0.
N130 G0 G28 X0. Y0.
(ROUGH AREA K)
(ENDMILL-.250-DIA-.50-F.L.-1.00-O.L.)
N140 T4 M6
N150 G55 G17 G90
N160 M69
N170 M11
N180 G0 B0. (CHANGE TO 90)
N190 C56.575
N200 M68
N210 M10
N220 X-.849 Y-.3607 S2292 M3
N230 G43 H4 Z4.54 M08
N190 G66 P0002 (F1.5 A2.9)
N200 M98 P0003
N210 G67
N220 G0 G28 G49 Z0. M9
N230 G0 G40 X-5. Y0 M5
N240 M01
N240 Z4.44
N430 M5
N440 G91 G28 Z0. M09
N450 G28 X0. Y0.
N460 M69
N470 M11
N480 B0.
N490 C0.
N500 M30
%
O0002
N250 G1 Z3.75 F4.58
N260 X-.824
N270 Y.3607
N280 X-.874
N290 Y-.3607
N300 X-.849
N310 Z4.44 F200.
N320 G0 Z4.54
N330 X-1.449
N340 Z4.44
N350 G1 Z3.75 F4.58
N360 X-1.424
N370 Y.3607
N380 X-1.474
N390 Y-.3607
N400 X-1.449
N410 Z4.44 F200.
N420 G0 Z4.54
M99

O0003
N10 C141.83
N20 C231.83
N30 C321.83
M99