I have a flight log from a P4P if I purchase a P4Pv2 will it start a new log or continue with the old one ?

The app can easily handle using multiple drones.
You can display all your flights on all aircraft or select which aircraft's flights to display.

Hi there. Thank you for reaching out. If you have your new DJI Phantom 4 Pro V2.0 and uses the same DJI Go 4 app, there will be a separate log that will be saved for your new drone as you switch both units. Also, as Labroides said in post #2, you can choose on how to display your logs. Thank you for your support!