g code created for M3, can it be used with EMC2

[russell]

You don't need to remove line numbers.
From the EMC2 manual:

"A permissible line of input code consists of the following, in order, with the restriction that there is a maximum (currently 256) to the number of characters allowed on a line.

• an optional block delete character, which is a slash /.
  
• an optional line number.
  
• any number of words, parameter settings, and comments.
  
• an end of line marker (carriage return or line feed or both)."
  
  
  

Russell.