I can't load it for a screen shot right now but on the left toward the bottom are the import object as morph option and you can drag over to select a whole folder of .obj files in the file selection on the right... this will load the whole batch on the selected body part. It will not import FBMs though. You would have load up each body part of the prop and then dial up the morphs on the body parts to make the FBMs. You can import FBMs from .obj for each part or a single total mesh using PhilC's Poser Tool Box but that cost money and will do only one morph set at a time. I guess this is very well explained but it is the best I can do right now.