The solution is clunky, but it works…
Col: <=999999999.99
Subtotal: 999999999,99
Result with subtotal: 999 999 999,99
Result: 999 999 999,99
Subtotal:
IF(SEARCH(",",SUBSTITUTE(CONCATENATE({Col}),".",","))="",SUBSTITUTE(CONCATENATE({Col}),".",",")&",...
