Need help programming G32 (lathe)

I need to cut a "thread" type feature. Unlike a thread, I need to ramp into the part, do the thread, and then ramp back out. I'm thinking G32 will do this.

I need to make about 80 passes at it (big feature), so I want to use a sub program to shorten things up. Here is what I'm thinking so far.

o0001
G50 S800 T0100
G97 S200 M03
G0 Z-.69 T0101
X8.875
M98 P0002
Z.68
X8.855
M98 P0002
Z.67
X8.835
M98 P0002
...
ETC.
...
M30





o0002
G32 U-.875 W-.4375 F.4375
W-7.55
U.875 W-.4375
G0 X8.875
M99



Could someone explain the G32 on a taper? Does the control maintain a constant lead in Z, or is the feed rate interpolated over both axes to give a constant lead along the taper? It shouldn't really matter, as it just a lead in and out, but I'm curious.