If you exported and imported them separately, you get problems. Use the box trick. In Poser, enclose the whole scene in a big box primitive. Now, export one of the objects and the box, import into Bryce, delete the box, don't touch anything else, except for applying the textures properly. Repeat for every item in the scene. Now you get the scene as it was in Poser. Group everything together in order to drop onto ground or similar actions. You can try that with exporting the whole scene enclosed in a box.

-- erlik