thank you for your detailed answer. I remove all copy parts from the mk file. For testing i place a folder named ammiberry2 in the config folder.
like this:
board/batocera/fsoverlay/recalbox/share_init/system/configs/amiberry2
after the first boot from Batocera i have this folders:
/overlay/base/recalbox/share_init/system/configs/amiberry2
/recalbox/share_init/system/configs/amiberry2
maybe there is a configuration file to edit for this, bud i have no luck to find it.