One way, you may separate them into layers.
when printing (to PDF), set other layers invisible. For example, all floor plans are in "Floor1", "Floor2", etc. layers, and roof planes in "Roof1", "Roof2", etc. If you make only Floor layers visible, you may get a floor only PDF.
Another way could be defining all floors into a block, and you may save block entities to a file.
bkvanbek wrote
I drew a house, floor plan, roof plan, cross section and four exposures all in one document. How do I separate each into a separate pdf page?