How do I use my P4P+ controller with a new P4P.  I would like to use the plus controller versus using the regular controller.  All help will be appreciated.

I believe you can just use the regular method, the AC will link to any usable controller with the link procedure

Just link your aircraft to the new controller using the usual method. Of course the aircraft can only be linked to a controller at a time, so the old controller will become unlinked, If by any reason you want to use the old one again you will have to re-link it again and so on...

The main difference of P4P and P4P+ is the screen. Linking RC may help you:

I tried linking of P4P+ radio with P4P and it worked just after binding the aircraft with new P4P+ radio...

I tried linking of P4P+ radio with P4P and it worked perfectly just after binding the aircraft with new P4P+ radio...