There is no setting in Poser for bevelled edges. You have to modify the object in a modeller.

Same for hard edges.

All you can do in Poser is to modify the crease angle or exempt an object or figure completely from being polygon smoothed.

 

Hmm, you could theoretically use the grouping tool to split an object into smaller parts, thus creating split (hard) edges, but it's very, very tedious compared to working in a modeller.