Sum up multiple ‘calculated fields’

Please how can I sum up about 5 calculated fields.

I have tried this code but I am not sure I got it right.

(function(){
var a = fieldname70.split('-'), b = fieldname71.split('-'), c = fieldname48.split('-'), d = fieldname68.split('-'), e = fieldname69.split('-'),('-');
return CONCATENATE(SUM(a[0].trim(),b[0].trim(), c[0].trim(), d[0].trim(), e[0].trim()),'-',SUM(a[1].trim(),b[1].trim(), c[0].trim(), d[0].trim(), e[0].trim()));
})()

I want to sum up the first five fields in the 6th one ‘One Time Investment Cost’

Thanks for your usual support.

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