Adding More trbacks for Trainer Backsprites

Hello all, I was wondering how you would go about adding more trbacks into the game, since just renaming a trback trback006 doesn't really do anything. My game utilizes multiple playable characters, and my trbacks stop working after trback004. So, I was wondering how I would go about making more of them, since the metadata file does not allow me to make changes there.

Edit: Nevermind, I found out how. It turns out that I needed to just look at the trainertypes number, and use that for the file name.