You may be able to re use the section of wire that comes from the power meter on your exterior wall through your wall and into the breaker box. I don't see any scenario where you would be flowing generator power through the overhead lines. Those don't belong to you I don't believe.
You have to have generator feed into the transfer switch and utility feed (after the meter) into the transfer switch. If you do this outside, the wire penetrating the wall may be reused going from the new transfer switch to the breaker, just depending on if it's long enough
You have to have generator feed into the transfer switch and utility feed (after the meter) into the transfer switch. If you do this outside, the wire penetrating the wall may be reused going from the new transfer switch to the breaker, just depending on if it's long enough