I was wondering if anyone could give me a tip on creating milling windows that avoid selected surfaces on large contoured nests. Currently we create our milling windows using the sketcher. We chain all the boundary edges of all the smaller surfaces inside the nest and then chain the outer part boundary. This tells the tool to avoid the smaller island surfaces inside the nest. This time consuming picking process gets worse with import geometry. ProE overlaps lines and leaves tiny gaps between lines...etc. Closing these loops sometimes takes hours. I've noticed when creating a Machine Window that you can Specify Geometry Type for Mill Window with Quilt-Collect only quilt geometry inside the window contour. Is it possible to create a mill surface (quilt) and then create a mill window: silhouette > and then change the Geometry Type to "quilt" so that the tool avoids the quilt? I can't get it to work. Or is there a better way to do this? Thanks for your help.