I working on Exercise 8-3: "Modeling the Stairs" in the book "Interior Design Using Autodesk Revit 2022". I am seeking help on step number 20 in the exercise. The book says to use trim and the boundary line draw option to modify the floor edge as shown in the figure 8-3.11, but I am unsure on how to use these tools to modify the floor edge so it meets up with the stairs I have created.
