Unfortulatly, you can not have different line types for walls for different views with out changing them. However, this is not that hard to do using the find and select tool.
If I understand your question right, you could use the ghost story feature. Use a light color for the ghost story and have the ghost story settings show only the walls, posts and other things you want.
Another option I use sometimes is to select and copy the walls you want to see dashed, paste them off to the side of your drawing, change all the heights to .01", group them together, put them on a layer called(whatever), change all of the openings to blank openings. You can use this set of short walls in lots of places like roof framing plans, joist plans, electrical plans,what ever,and you can change the line types and fills to what ever you need them to be. I usually give them all an elevatoin of 50' or so above the roof so they don't get in my way with 3D editing.
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