5 axis post mods - shift value on pt_shftmx variable

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hi all,

I have a 5axis HMC machine with x.y.z,b and c, both b and c are rotary tables, c axis seats vertically on the b table...

so far we have been running the c axis [xyz] matching the exact center of b rotation.... with no problem at all.

Now I need to set-it up at the right side edge of the table that is x plus, exactly at 366.45MM away from center of b rotation...

I have to input the shift value on the post [pt_shftmx]
reason why on x; the c axis is actually facing the right side on the x axis... the same on the mastercam, the right side view- we use to program.

_when I setup in the pt_shftmx variable 366.45mm the g-code on x and z are way off...

I am wondering what am i doing wrong...???
is there any special way of programming it on mastercam to accommodate the shifted set-up?
if so... how to program it then?
do I have to create a wcs for the b rotation? how?

thanks guys...

ps. I checked my machine definitions manager and shows
B around Z
C around Y