Welcome!
Is the WBR our main host router with an active internet connection to your ISP modem?
If it is, then regardless of what you connect to the WBR, a device will get internet. Now if the WBR does not have a Internet connection to a ISP modem, then you can use it as a network switch alone and connect devices to it and map drive to shared out folders on each PC. You'll need to refer to Microsoft support and information on how to share out folders on PCs and use Map Drive to connect to them.