To make a custom campaign you need to edit the original campaign files. The way this seems to have been implemented is very shoddily done, as you apparently need to edit the original files. Can't have two custom campaign in other words.

The file you need to edit is script.lua, found in Panzer Corps ...

You're not supposed to blitzkrieg. The enemy usually comes at you in waves, or activates when you get close enough. The idea is to generally keep your troops bunched up and take of one problem at a time. The AI might have ten times the forces compared to you, but usually, you are the one who has ...

Thank you for coming to my Ted talk.

Well, so far I've figured that the Script file found under campaigns/main is useful. Same with campaign.json. Though this would mean that you can't install several custom campaigns at once, as these files need to be edited. Don't know how to use path_selection ...

The deadly AA trait makes the 8.8 a real killer. With some experience, they are shooting down half the air wing in one go, after which fighters can finish them off easily.

Didn't find any infomration in editor manual. How do I create custom campaigns?