I routinely get into this situation and struggle (spend way too much time) to find a solution.
In this example, I want to duplicate the set of holes in one object onto another object and maintain the placement of the holes with respect to the face. While I can accomplish this using many guide lines and points, there must be an easier method. The objects are aligned in the red axis, but at different heights (blue axis).
Secondly, is there a method to duplicate the countersink for multiple holes without manually modifying each hole?
As always, any help much appreciated.