Each line is a group of buildings that have similar functions and are upgradeable from one to the next. Buildings are in “lines” such as the “Cannons” line. First, a word on the way that the game handles buildings. Or perhaps you want to edit a particular building to fit your exact needs – maybe make it stronger, weaker, or more unique. Once you have successfully created your own units, you may be wondering how to get them into the campaign. This guide assumes that you have unpacked the data files using the method found Search Search for: A Guide to the export_descr_buildings.txt file