Set up the Layers. Start by setting up the layers for the project. You will need at least one layer for each floor of the building, a layer for the lower roof, upper roof and foundations. Foundations on an old building can be tricky to draw, unless you have some detailed and accurate drawings to work from.
You can use the Model Setup dialog box, or you can use the organization dialog box. The model setup can be used, but you will still need to edit the layers in the Organization dialog box.