Welcome to the forums,
There's plenty of info around about importing things into TG2, it's only a matter of combining search-results:
*googles* for "bryce export format" and the first hit =
http://www.daz3d.com/i/faq/0?id=211TG2 imports .obj so ideally you would like to export to that, so does Bryce export to .obj? Yes it does.
Either 1) import the exported .obj directly into TG2 or
2) after exporting to .obj from Bryce first import into Poseray, resave to .obj and then import into TG2. (somehow TG2 likes Poseray saved .obj's better).
Problems may rise with textures sometimes, if so then please report back

Cheers,
Martin