Autodesk Inventor is used for design in all project phases to setup the general layout, the basic and the detailed design of steel structures. The core competence lies in conception of CAD-models, in parameterizing, in preprocessing for mechanical analyses. With specially designed functions using the programming interface, the creation of CAD-models is efficiently automated. In combination with generalized design approaches (Top-Down), a high iteration speed is ensured during the construction of variants so that designing requirements can be met optimally. The result is technical drawing of steel structures, which meet the requirements of testing and production.