I have a custom product that has several divisions, the bays can have any one of three different sub assemblies.  This all works well except there are times when when a division has shelf line boring on face 5 and assembly holes on face 6.  I realize that I could flip the sheet but Why?  The assembly holes could be punched from face 5 as they are through holes, I have tried several things to come up with a solution which is probably pretty easy but it eludes me.  Any ideas?