I am going to demonstrate how to combine the two tools, BOUML and CMake, to create the simplest possible QT3-based classic "Hello World" application.
First, in BOUML create a project under a name hello_world in a directory hello_world/model. Then select c++ as a working language. In the browser pane right-click to access the Edit generation settings menu, where in the "Directory" tab we will enter hello_world/gensrc as a c++ root directory, where all the generated source code will be saved.