@mitu yes I have already installed ppsspp emulator on retropie..
Now how I can configure runcommand to say "ehi runcommand it's ok I have 2 ppsspp emulators let me choose between first or second to launch"
The first one is ppsspp , the second one is ppssppsdl...
In the configuration file of first one
Can I add the line posted by you ?
Seems simple to do, I try...
xxxxxxxxxxxxxxxxxxxxxxxx
Added this line to psp emulators.cfg

ppsspp-vulkan = "XINIT:/home/pi/games/ppsspp/ppssppsdl %ROM% --fullscreen"

Ok solved YES IT Works...
xxxxxxxxxxxxxxxxxxxxxxxx
Now runcommand let me choose what version of ppsspp to use...
And added ppsspp-vulkan to runcommand menu...
Thank you very much...
There's always something to learn!