NEMA 23 changing rotation direction on one motor

Help, I may have asked here before but I seen no response so I thought I
would try once more.

I am using Turbocnc software and want to set up one motor to turn in the
other direction.
I can edit the G code and put in a - when working from 0. But I was hoping
there is a way I could reverse the direction in the program for the axis.

Any idea on how I can do it without changing the G code for that axis.

Sorry for posting same question twice. I am just hoping to get help with the
problem.

Thanks,
Troy