I am trying to convert 2D polygons to 3D Contours with the 2D Polys to 3D Contours command. The problem I am having is that when I initiate the command and the set elevation dialong box appears, the command chooses all the polygons on the layer, thus making it impossible to assign contour values in sequence. The polygons representing contours were converted from Autocad polylines. I have the polygons in a clean seperate file with the active only layer option chosen. The manual says that when the elevation dialog box opens... "the first polygon in the drawing order is highlighed". Based on this clue, I have tried copying the polygons in order to another layer, to no avail. (It does work if I draw new polygons in sequence. But the documentation makes it seem that you can use this command on imported data.) Any suggestions?