I employed a RG plane to section my assembly, then rotated the view to show the sectioned and adjacent faces, then named the view and saved the assembly.
When I create a drawing of the current view from the assembly, the orientation is correct but the model is whole, not sectioned.
How can I make it sectioned?
When you save section view in part/assembly then make sure you choose Drawing annotation view.
Then in the drawing, in the View Palette you should see view(s) with section arrows. That is the parent view you need to insert first and only after that you can put the section views saved in part/assembly.
More details here: Section View PropertyManager (Models)