Also there are tools such as several by Dimension3D that will make the mesh data external to the .pp2 file so that multiple applications of the prop in a scene reference the one set of mesh data in the geometries folder. Poser File Organizer is a very useful application for managing runtime content and it can extract mesh data from props to a geometry sub-directory. The mesh data can be externalized by 'hand editing' as well and there might be some tutorials around on how to do that. Multiple instance of the chair can be saved individually or as a group to the Props Library and they will load where they were positioned when they were saved. You can also "memorize" the default location on each chair before saving them singly or as a group.

BTW a full scene can be saved lights and all as a .pz3 and placed in the Figures Library with the file extension changed to .cr2 so that the whole scene loads with one click but you will have to be sure the scene elements and their referenced files are where they should be in the runtime so that the scene loads properly.