You can do this by cutting the piece in the assembly or part workbenches and then doing an isometric view of it. Once you have it in the drafting bench, you can isolate the view and undo the section cut (on the part or assembly bench), so you don't get problems with any other view that needs to be updated...
You can use Breakout view command at front view for instance, then "transfer" breakout to isometric view. (use contextual menu over front view MB3>Front view Object>Apply Breakout to ... select the isometric view or another one).
After apply breakout view to isometric you can remove breakout from Front View or delete it.
Thanks for the info on Ignitecast - I'll have to give it a try. You've definitly provided a good example of how-to videos.
I think CATPart was asking about sectioning a 3D view directly on a drawing. I believe Sparck provided a good solution that should update with any part changes.
CATPart there is a way to make a view like you show. I guess you want it on a drawing.
1-Create a front view of the part normal to the future breakout view
2-Create the breakout section
3-Create a ISO view like the one you show
4-Right click on the borders of the first front view and choose "front view object" --> "apply breakout to" and pick the ISO view
5-Hide or move the front view