This past month, Autodesk Infraworks 360 was released. The user interface has been changed to be more contextual, were each icon will lead us to a specific group of commands.
As you can see from the capture, you are given a few choices to select from the top of the screen. For example if I select the I, the following options will be presented.
From here, create and manage your model, select model features, create conceptual features, and analyze your model.