In additon, you can use the clip section command from the View toolbar to turn on the clip section and then use edit section to line it up. Here is an image showing having the sketch in context of the assembly and then what it looks like after I turned on the clip section. I was able to clip the section in context of the sketch as well.
thank you for the suggestion. It's what I use actually, but the clip section doesn't inherit the plane in use, so for each sketch I need to edit the clip section plane and save as for each sketch plane.
Catia has a clip plane in the sketch, very useful.
While in the View Section dialog, if you look under the Section Plane section, there will be a pulldown that controls which CSYS you're referencing while in the Sketch. I believe if you change it to WCS, then below that select the Z plane and make sure the plane offset stays at 0, you should be able to snap the clipping plane to the same plane of the Sketch.