You can copy /usr/share/emulationstation/es_systems.cfg to /userdata/system/configs/emulationstation and add the systems
or
You could create /userdata/system/configs/emulationstation/es_systems_cps{1,2,3}.cfg and put the following text in them …
<system>
<fullname>CPS#</fullname>
<name>cps#</name>
<manufacturer>Arcade</manufacturer>
<release>1997</release>
<hardware>arcade</hardware>
<path>/userdata/roms/mame</path>
<extension>.zip .7z</extension>
<command>python /usr/lib/python2.7/site-packages/configgen/emulatorlauncher.py %CONTROLLERSCONFIG% -system %SYSTEM% -rom %ROM%</command>
<platform>arcade</platform>
<theme>cps#</theme>
<emulators>
<emulator name=“libretro”>
<cores>
<core>fbneo</core>
<core>mame</core>
<core>mame0139</core>
<core default=“true”>mame078plus</core>
</cores>
</emulator>
<emulator name=“mame”>
<cores>
<core>mame</core>
</cores>
</emulator>
</emulators>
</system>
#Change to cps1,cps2,cps3