How to Apply Payments to Aged Receivables Automatically using Excel VBA

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I am new here. I have attached an excel file of the problem. I have several rows representing customers who owe (receivables). These receivables have been aged into 0 - 30 , 31 - 45, 46 - 90, 91 - 180 , 181+ ; The cumulative balance appears under the column named " Balance Due". The debts or receivable amounts are in positive . When the customers make payments (negative in the attached file) our system is supposed to automatically apply it to reduce reduce the oldest aged debts before applying to the recent debts. Unfortunately the system we are using is not able to do that. As result we do that manually in Excel. This is very tedious since there are about 1500 rows. I will be grateful if I can get an excel vba that can be ran to do this automatically.

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