Mohammed Sabeer, a promising CAD Designer and Multimedia Trainer, has presented a nice video tutorial that analyzes how to make an attractive gable end on a sloped roof with the help of AutoCAD 3D. One can get familiar with several solid editing tools useful for any modification based on edge, face and body levels of a 3D solid.
Associated files necessary for applying this tutorial:-
2D Elevation drawings: www.dropbox.com
3D Drawing file to start the tutorial: www.dropbox.com
Completed 3D drawing file with porch: www.dropbox.com