…and just to lead you somewhat further astray, even after you locate the ‘Save to Library’ button for P2010, you may still find that importing full pz3 scene files has some other advantages. 

For example, it allows you to import a figure in a scene along with all of its keyframes for an animation or morph changes.   You can also set up a Poser '.pp2' file to allow you to import a full '.pz3' scene file by clicking an icon in your Prop Library.