[Zope] Product inhetitance question

Hey all, Say I have a fully functional (and more importantly, working) Product will call A. I want to extend this Product's capabilities so I wish to derive another class from it, call it B. No problem, class B(A): ......... The question is, (I think the answer is no) is there a way to inherit (i.e. reuse common code and extend it) the manage_Add function and the dtml files from A??? Thanks, DR