It is impossible to create SOLIDs using SAP2k interface, and editing .s2k file is pretty boring job.
My experience says that the best way is to draw them using AutoCAD and import .dxf file into SAP2k.
In AutoCAD, future SOLIDs should be drawn as meshed polygons (use 3D AutoCAD command) not as solid 3D objects. [sig]<p>Zoran Brujic<br><a href=mailto:zbrujic@uns.ns.ac.yu>zbrujic@uns.ns.ac.yu</a><br>[/sig]