How to Import a Bryce Object into Poser:
1) Select the object in Bryce
2) Click on the little "E" that appears next to it. This will bring up
a edit mesh window.
3) Then click "Cntrl d" and it will give you a bunch of different
formats to save it in. I chose Wavefront *.obj.
4) Bring up Poser, and import the obj file. For the hearse, I scaled
it up 300% when I imported it. Other than that I used the default
settings.
5) Save it to the Props library, or texture and then save it.

This only will work for "edit mesh" type objects in Bryce, it will not
work for trees or terrains. It does work for the rocks.