I have a fine pitch SMT PLCC. I would like to have a different SMD pin to SMD pin clearance value for that part only.
For example, I want a 12 mil clearance for SMD pin to SMD pin on the entire board, but want a 6 mil clearance within
this one SMT PLCC footprint (symbol).
Go for board geometry constraint region option .But it will be available in Allegro Performance ,XLconfiguration