There is a property called "Underlay" that pertains to Views. Most likely, your Level 2 floor plan view has this property set to "Level 1". Set it to "none", and just continue working on Level 2. If you have Revit 2010, you can right click on an empty space of the view > View properties. In Revit 2011 it will be in the properties pallete. You can set it back to "Level 1" when you want to use the lower floor elements as a reference.
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