The grit of the plan is simple, the score relays usually supply the signal to ring the bell...bell, chime, etc... all the same to the logic.
coil voltage needs to be the same, or darn close. nope, keep it the same for more reasons than we have time for.
a switch on the score relay, ie, the 10 point relay, sends power to the bell/chime.
look on the schematic for the correct wiring of whats already there, and copy it for all.
it shud be the same for each score relay.
the coils will all share the same common.
the big question...does the score relay for the nonexistent bell have the same switches?
prob not.
in that case, you will need to add a switch to the stack. ha ha, have fun with that.
but that is whutcha needta do.