I have one personal cellphone. I want to add a second number for my business, but I want the calls routed to the same personal cellphone. Does verizon do this? And how much is it?
You may want to look into getting a Google Voice # and add the Google Voice app to your device.
Verizon MAY be able to do this on some devices which have eSIM capability such as iPhones and Pixel phones, but you would be charged for 2 lines to do so. With a Google Voice line, you would get what you want at no cost above your initial line.