Cooking Question

I need to modify some of the original assets of the game for the Ragnarok map. As Ragnarok isn’t in the mod content files, I have to modify the original assets for my changes to carry over. Specifically resources like trees, rocks, etc. So in my situation I don’t believe copying/childing a new asset will be possible."

With that said, if I modify the base assets, can I still cook those changes into a mod file?

If so, how can I keep my changes? Every time the editor needs to validate or update, my changes will be reverted back to their original settings, right?

Or does cooking somehow prevent that?