"You have to pick the curves in each group individually and in the correct sequential order that you expect to see in your surface. You can not use a selection box. You don't have any control over the selection box ordering process."
"ChamferEdge is basically just FilletEdge but it outputs straight surfaces instead of fillets. All it takes for input are edges, so ChamferEdge has no way of knowing which distance you want where. ChamferSrf does."