The minute you imported your model into Poser it became a prop. So no. You can create and load morph targets for your model without turning it into a .pp2.

If you want to save it to the library with your created poser morphs attached, then you'll want to save it as a prop. The prop you generated/saved to the Library will have embedded geometry. If you plan on sharing your morphing prop with others you'll want to remove the embedded geometry from the .pp2 and have your prop, rather, reference the original Obj in geometries. This is standard practice, but it's sort of a pain in the ass. Maybe Poser 12 will finally provide a built in utility to do this.

You can either do this manually by chopping out the obj blocks from the .pp2 file in a text editor and inserting a file path reference to your obj in Geometries, or use an automated utility solution for this. I use Netherwork's Content Creators Toybox...

If it's just for personal use just leave the embedded geometry info in your saved prop, or just save a pz3 scene with your morphing model, and use your original obj for further morphs if you like. It's not a big deal really.

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