Thank you megavolt
This solved my problem.
Would be easier if it was done automatically by KDE, since “Template” directory is created by default - you just put files in it and it makes for each one a Desktop Entry file.
I will try to write a python script to do this using your indications.
Same problem goes for “Public” directory which is created on installation but nothing is automatically done - you have to configure it as any other directory.
Thank you again for your help