Hi Steve,
all you need is in the toolbar below:
by default, the top and perspective viewport uses the top CPlane, the front uses front, right uses right etc. You cannot undo CPlane commands using Undo, instead use the previous CPlane icon in the upper right. Every view is able to use it`s individual CPlane. To revert everything use the command _4View two times.
Does this help ?
c.