You can but not like Poser where the mesh bends as well. The figure has to specially prepared so that either the joints are hidden or you model using cylinders and metaballs linked to the appropriate "bone". IOW you can't just import a poser mesh and add "bones" to it and pose it, the joints would seperate. Now if you don't have Poser there is a free program called Anim8or that can bone meshes but I haven't worked with it much so can't tell you how easy or hard it is.