Hi all
the LevelD 767 FMC can only read .rte files, I don't know why they did not implement .pln.....they will have their reasons!!! I also fly the LVLD767 the only real workaround I know of is to import a .pln into EFB then copy it using the clipboard function, then go to SimRoutes.com paste your route into the generate routes side and last but not least then export it again into your 767 navadata file. its not the easiet way but its the only way I know of.
Regards
Grahame