What do you mean about CBA and product development?
Rates of return, safety features, comparing system design features etc?? Portfolio management i.e, got lots of stuff I want to do what should i do.
Basic rule I always thought was 3 times total invested. That is a new feature should pay back 3 times what you put in to get an outcome. NPV discount rates are a little harder, 20% for short term stuff. I.e. if you bought on your credit card would it be a good idea, for short term little things. 8% or so for bigger things. Net present value - Wikipedia
Most tastiest i have seen is ECV which creates a decision tree then solves with monte carlo
There are lots of people working on this on the manufacturing / system engineering side and the ideas can go very deep.
Cant think of a good in one place resource off the top of my head. Maybe some of the IFMs stuff at cambridge had a good lecture on the various techniques once.
http://www.ifm.eng.cam.ac.uk/service/books/