Change enemy settings

[Stangi]

How would you change some of the monsters settings (e.g. spawn sound and music) AND at the same time have all the new files in the custom story folder?

If I copy the original servant_grunt folder, change the file names to servant_grunt_2, and just let it stay in the original enemy folder, it is easy to edit the .ent file, and then place a servant_grunt_2 out in the editor. But that wouldn't work if the story was to be shared on the internet, since the new enemy is in the original enemy folder.
If I move the servant_grunt_2 folder in my custom story folder, I can't select it in the editor. How can I have the enemy folder in my custom story folder and still make it work