I am not sure of what you mean.
I used adding machines for twenty years before calculators came along.
If you add a long list of numbers and pick 'subtotal' you will get the same number you get when you pick 'total'. The difference is that with 'subtotals', can still add to the total. If you select 'total', the machine will clear the 'memory', and will begin with zero.
Perhaps you could explain.