@FlightPathOBN
Surely if you are designing procedures you are doing it to meet a set of requirements. Those requirements are drawn up in some document. If you are doing it in an area that has adopted PBN you will be using the PBN specifications for RNAV or RNP as codified in DOC9613. If you are designing them in an area which has not implemented PBN you will be using some other published standard.
It's a little unclear to me exactly what specification you may be using! You say you are designing RNP transitions to GBAS final and don't care what it's called. However, what it's called is vital as to how the procedure is used and what regulations apply to it.
The original question was from a nation which like many others have implemented the current ICAO PBN standards, standards which replaced the previous RNP standards but which include both RNAV and RNP specifications.