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3 Threads found on edaboard.com: Back Drilling
I believe, your back drilled vias will also use an unique padstack, so it may be appropriate to define it as blind vias which also involves separate drill files.
It is a process to remove the unused section of plated through holes. This will ensure signal stubs are minimized; Stubs are the source of impedance discontinuities and signal reflections which become more critical as data rates increase. It is preferred method in HS designs. Allegro handles back drilling processes. Regards, M
I think did an article on pcb drilling machine a while back go to and do a search on pcb cnc or some such