All imported meshes should have the E icon for editing. But one thing I have learned, some 3D apps have many different option for how to export the group. They can be imported into Bryce fine, but try and export them out of Bryce and crash... Example... in Poser you can not select individual meshes on the head, ie... lips, teeth, eyebrows..ect.., but they do have there own material selection in Poser. When they are exported out of Poser with all the options enabled, then imported into Bryce, low and behold they are separate meshes. But Try and export any part of that Poser out of Bryce it will crash every time.

Stephen Ray