I checked this issue but i couldnt find a proper solution. I was just wondering if there is way to keep working on the extrusion like in SketchUp. For example lets think we draw a closed curve and via ExtrudeCrv command we make an extrusion. But after a while when i want to extrude it again or even extrude a different surface of the 3D object i cant find a way to do it and i start to draw it from the beginning or explode it and choose a surface and do my extrusion and try to join all them again. That work amazing in SketchUp if there is a similar way would be nice to know how!
thx in advance and cheers