How can I put something into the prop library that consists of more than one prop? For example, if I load a cube and a cone, place the cone on top of the cube, make it the cube's child ... when the cone is selected and I click on this + symbol I can save it as smart prop, if I like. If the cube is selected and I click the + then only the cube goes into the library. How can I put the complete object into the library (without exporting and re-importing it as a new geometry) ? I guess that's pretty much a beginner's question but somehow I seem to have missed that one. Thank you