Come on -- that is the most basic concept in all of Google Voice. Do some reading. Yes, that's how it works. A Google Voice number can forward to any combination of one to six different forwarding destinations. Five of them can be 10-digit telephone numbers, plus Google Chat, which is now only used for OBi devices, which act as chat clients. It's your choice (via settings on the Google Voice web page) as to whether or not any or all of those destinations ring or don't ring, controlled by check marks next to each destination. All destinations ring simultaneously, not sequentially.
You can also set up groups of contacts, or even individual contacts, and control which phones will or won't ring when a call comes in from that number.
Hangouts operates independently of Chat/OBi. Whether or not Hangouts rings is controlled by a setting on the Hangouts clients for computer web browsers, phones or tablets.
Here is the Google Voice Help Center. It is organized in to bite-sized how-to topic chunks, written in 7th-grade English, that almost anyone can understand:
https://support.google.com/voice/#topic=1707989