M97 Internal Subprograms?????

m97 slot  M97 , M99 , M98 ? Different between M97 & M98? How to reduce How to Create slot M97 is the M-code Used to call a Subprogram with the reference of the line number N within the same program Pxxxx code is used as a line number to be repeated

Haas CNC Local Sub-Program Call M97 code calls a subroutine referenced by a line number within the same program  Haas CNC Local Sub-Program Call M97 code calls a subroutine referenced by a line number within the same program

Question: use subprograms M97 Using Subroutine Call, write a G code program to mill the three identical T-slots in the shown part  Question: use subprograms M97 Using Subroutine Call, write a G code program to mill the three identical T-slots in the shown part