Good Morning @robinc.52s360,
Community is largely populated by fellow members, like me, doing their best to help other members, like you. Staff (you guys) does drop in here from time to time, however, direct support is, for the most part, done through Republic’s ticketing system. More here: Getting Help from Republic.
I also see no one has provided a direct answer to your question. We do not own our phone’s secondary number, so there is no way to flip your public facing Republic number to be your phone’s secondary number used for cellular routing purposes nor would you be able to transfer the secondary number to Google Voice (or anywhere else) if it were possible.
@drm186 has pointed you to the most commonly documented workaround for getting a Republic number to Google Voice. Please know transferring your Republic number to Google Voice also cancels your Republic service. If that is not your intent, please let us know which Republic phone you have and whether you care about keeping the plan on that phone.