[@Willy Vereb]

It would also be worth mentioning that while shelters would be oriented to preserving humanity, total restoration of life prior would be incredibly expensive and entail facilities no doubt larger than need-be. It's more cost effective and relevant for something to be built with labs and units dedicated to learning how to purify water than there is to learning how to totally fab a car or cryogenically freeze air to produce argon gas for nanotube production. Caution and costs would no doubt make planners think more about how to keep dysentery from killing their descendants than how to have as many lasers  guns as possible.

The rest can be figured out or re-discovered on the surface. The possible extent of in-shelter manufacturing would be the basic tools and skill for shelter unkeep with spare metal parts to keep fans and wires in check. Anything bigger would mean that you're building a more expensive shelter than need-be with some hard to produce and procure materials inside.