Hi Guys - I would like to reduce the cost of building wooden forts. I have dbeditor and packfile manager. where to i find the file to edit please?

Also - in the cost of units , does the upkeep represent how much it costs per turn or per year (given that it is 4 turns to a year)
I ask this because I am begining to feel that the upkeep costs are too high overall when you compare the tex revenues of each region per theatre.