Try with PropViever 3 (ShareCG) to convert 3ds to obj format and then import obj into Poser.

PropViever supports 3ds keyframes and so, it puts all the elements of the model in the correct place. Most of the times it works, but sometimes it fails and leaves the parts glued or in wrong place. Until now I don't know why, some 3ds mystery secrets ???

In either case each part of the 3ds mesh has a group name in the exported obj format.

Stupidity also evolves!