Is there a way to re-use design constraints if the stack-ups are different? I just finished a 12 layer board and am now working on an 8 layer board which requires the same constraints? Ultimately all I would like to transfer is the spacing constraints. Is this possible? Any help would be greatly appreciated.
You could try from Constraint Manager use File - Export - Technology File, the just select physical and spacing. In 16.6 there is the ability to create a generic tech file that uses Top, Bottom, Internal Signal and Internal Plane.