How can you edit an existing Poser 5 model? Like making something longer/shorter, adding humps, spikes or just over all re-shaping something? I asked this before and someone said to use that Wings program, but it can't open up poser files. So just how do you do it? also how do you save more then one object as a single prop? Every time I try it only saves one peace of it.

Look around for tutorials and discussions on "Using Morphs" "Installing Morphs" and "Creating Morphs." Also look into "Magnets"; see Doctor Geep's fine tutorials on using magnets (and many other things; links posted frequently around this place.)

Wings can not open a Poser PZ3 file but it can import an OBJ file. The OBJ file is the scene geometry obtained in Poser by going to File/Export/OBJ.

When saving props containing more than one item click on the "Select Subset" button and select all the items in a scene that you want to include.