Having recently gone for my NVFR rating, yep, that's exactly how it works. There's no "credit" as such.. although I'll admit it is mighty confusing.
The NFVR Rating comes with an NFVR Endorsement in whatever you did the test in (eg. SEA), but you then need to get NFVR Endorsed in anything else you're flying (assuming you want to fly those NVFR) - be that Helicopter, Multi-engine, etc. That means you also need to include night flights in your BFR to keep flying those aircraft NVFR.