I had a read through the Beginners book for Blender. ‘Blender for Dummies’, it does contain anything on this for layer movements, it only mentions objects. I guess that means that blender obviously doesn’t have a option to hide some faces?
The alternative is to create a copy of an object, and delete the faces that aren’t needed while getting on with another task and then delete every with the exception of the faces to place back.
My example here explains this, I had followed the video clip which I thought went a little further than I had needed to but I had to try and get the chin area done first, but went to modeling out the head part before the chin. Blenderella tutorial.