Editing existing campaigns

[chris h]

Is there a guide somewhere to do this? Basically all I want to do is change the time allowed to complete. I find many of the existing campaigns have unrealistic short times to complete each scanario.

For example, in the China '37 campaign the distance by road to the furthest victory hex is 54. Even with no opposition it will take 8 turns leaving just 11 of the 19 turns to fight through effectively two lines of entrench troops in a village and on various hills. I got as far as starting an assualt on the second line when time ran out. I still had 15 hexes to go to the furthest victory hex.

I know you have to extract them first then edit each and then re link them but theoroes OK but in practice it's turning out to be 'difficult'.