hello michael
Do you want to enter it in the .MIN program?
Then simply put the text in parentheses ...
e.g.
N0722 M00 (blow out part)
or
N0722 M00
N0723 (blow out part)
If you want to insert it already into the dialogue then that works by programming a manual NC block at the correct place and put bracket around it ...
Regards
armin