i'd like to know how this is going to work for people like me who already have a google voice number and a sprint number. I have no desire to get rid of either

i'd like to know how this is going to work for people like me who already have a google voice number and a sprint number. I have no desire to get rid of either number as I use one for personal and one for business. Will I have to create a new google account to route both numbers through GV? Then what number will my phone chose when dialing out as I don't think there's an app to select what phone number to call from or a way to use 2 different GV accounts from one phone.