Changing/updating existing policies

Hello everyone. I’m new to this forum and I recently started working on my first Democracy 3 mod.

My mod will be about a new situation, and as such, I’m creating a bunch of policies that relate to it.

However, there are already a few policies in the vanilla game and on steam workshop mods that could also relate to my situation. It would make the most sense if those policies had a synergy with my situation.

My questions:

  1. Can I change/update existing policies, both vanilla and mod, in order to create a relation/synergy to my situation? Is it legal to do that?

  2. If I can, how do I do it? Because, everytime someone makes a mod, they create a new folder within the democracy 3 folder. My concern is, how to update a policy without creating conflict with those files and how to avoid duplicating policies within the game.