As far as I can recall.... You can call custom macros with a "M" code, "G" code, "T" code or "S" code..... Can't think of being able to call with "A". Maybe he's confusing it with a macro call line and "A" being a variable set on the call line??
Of course, I'm not sure why you'd want to use an "A" command for a B axis.... Seems to confuse the issue for me. Something else to check for.... It might not be a FANUC thing. Look in the programming manual for Toyoda. Maybe they have some code that used for that purpose. Something they added on top of the FANUC base system....
It's just a part..... cutter still goes round and round....