How to generate new scenarios/campaigns

I’ve found the modding guide which helps with creating new/modified units - but
what about creating a new campaign with new scenarios. Given the folder structure and text file driven
scenario files - it gives the idea that you could relatively easily define your own scenarios
If you created a new campaign folder alongside “the great war” and mirrored its structure with
your own edited scenario files underneath - would the game recognize a new choice in campaign?
Anyone try this?

Ok, so I have a second campaign that can be selected - with twelve scenarios in it (still tweaking).
I believe I have them all linked correctly, but I cannot seem to have the first one unlocked like the default
campaign. Still working…