Hi ajax, Thanks for the explanation. I'm with you now (more or less). The second method seems reasonable,but I'm not sure about a couple of things. Here's a screenshot of the arch (planar/Z-axis/unsplit, and scaled up/down - V direction, right?) to show you what I think the problem may be. See the way the vertices are skewed like that? It makes them difficult to deal with because each section is a skewed slice. Also, I'm not sure what you mean by 'select all of the verices along the bottom edge without picking up any from the top edge' It doesn't look possible to me with this geometry. I could always make a tube in uvm and delete the parts I don't want to slice it. mac