Fair point to all, I should not have linked P-RNAV and RNP-1 since it's not that simple. I was just trying to keep it basic for capt.topgun since he seemed new to it all.
capt.topgun, you'll need to find references for you part of the world and your company I'm afraid. Like FE Hoppy said, there is no standard method of implementation. But hopefully you're now clear on the basic difference between flying overlay departures to B-RNAV transitions and P-RNAV departures.
P