'Finding the sum of subreport passed values in the main report in ms Access

I have a main report for orders and a subreport for payment installments for each order. I have been able to pass the values from the subreports to the main report using in a new textfield

IIf([rptPayments].[Report].[HasData],Nz([rptPayments].[Report].[txtTotalPayments],0),0)

I am having trouble with summing these values passed from the subreport so I can have total for all payments in the main report footer



Solution 1:[1]

One way to do it is to look for the Running sum property of the field and choose either of its options(Over Group), or(Over All)

Running sum

Sources

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Source: Stack Overflow

Solution Source
Solution 1 Sola Oshinowo