o-codes and ngc file

I'm in the process of remapping M-code for my tailstrock.

Question about M-code :

I haven't found any M-codes already made for the tailstock.
I saw that haas uses M21 and M22.
Can we remap these two M-codes or should we remap only M100-M199?

 

Question on ngc file.

I would like to make only 1 file for all my remaps. Is it possible to put several o-sub in a single ngc file?

like :
o<tailstock_advance> sub
.
.
.
o<tailstock_advance> endsub

o<tailstock_retract> sub
.
.
.
o<tailstock_retract> endsub


 

1. You are free to allocate either M21 or M22
linuxcnc.org/docs/devel/html/remap/remap...:unallocated-m-codes

2. The ngc file needs to have the same name as the subroutine it contains so you need to create separate files for M21 and M22 subroutines.

Thx you for your answere, all works fine