Learn,
I've done long part in the past, some long copper bus bars that needed a lot of tapped holes. How do you relocate for each position? We actually did it by using a tool or pin in one of the holes. We put the pin in the hole, paused, unclamped the vise, let the tool move to a new programmed location, and reclamped. I am getting ready to drill holes and finish both ends of a long part using this method, by using an end mill to make the holes, round the ends off and relocate the part.