Unable to copy linked attributes

I'm unable to copy art boards that are linked together with prototype attributes without loosing the attributes. When I select and copy they loose the links and I'm forced to repeat the task of adding prototype attributes etc. Same result if I duplicate them. Very tedious when I have spent time tuning each link with triggers, animation, easing type, transition times etc. I need copies of them to use in a different context and user flow in the same document.