The tool has two functions, edit/create premade households and edit/populate worlds with those households.
Save Game (EA premade households)
The tool will take any EA premade household from a save game file and save it as a new household template you can put in your mods folder, the next time you start a new game that household will look exactly like the save file it is based on.
The main idea with this is to do makeovers, for example you can take the Bjergsen househ