I'm writing a script for Xpedition VX1.2 in which the script searches for blind/buried spans within the design that can be reduced.... for instance I have a 22 layer design that uses 2-11, 12-21, and 2-21 buried spans. I have a script that analyzes and finds 2-21 spans that can be changed to a 2-11 where connections do not exist above layer 11. I'm not seeing methods in the automation interface that allow either changing the span of an existing via, or deleting the 2-21 and replacing with a 2-11. For that matter I don't see a method of adding a via with a particular span to begin with. Maybe I'm just not looking in the right place? Can anyone shed some light on this?