Pack File Manager: How to edit mods?

[Republican]

Hi, I need some help. I just downloaded PFM and I am wondering how to "edit" a mod on the workshop like Kazel's Romans.

Here's what I want done:

1) I want to change the Legionary cohort variant mesh so that they do not wear italic helmets, just Gallic helmets.
2) Revert the shield of the Eagle Cohort so that it is just the Vanilla shield, not Kazel's shield design.

- Now, I have taken some advice already and deleted the italic helmet from the "models." However, when I play the game, the legionaries only wear the Gallic helmet (which is what I wanted) and the legionaries that would wear the italic helmet just wear nothing.

How can I make it so that all of the legionaries wear the Gallic helmet?

A step-by-step tutorial would be much appreciated if someone would be kind enough to do that. You would receive my gracious thanks.
-Nick

[AngryTitusPullo]

Moved from Tutorials.