I have a spreadsheet that lists shipment number (in column
a), estimated shipping dates (in column b) estimated
payment due dates (in column c) which are usually 45 days
after the shipping date. Each shipment has a total dollar
amount (which is column d) and in the next column I would
like the spreadsheet to automatically capture the total
dollar amount for the all the shipments that will remain
unpaid during the payment term of a particular shipment
number. For example:
Ship.# Ship-Date Due-Date $Amt Total-Outstanding$
1 4/12 5/27 56 167
2 5/25 7/09 72 167
3 4/17 6/01 39 167
4 5/28 7/12 60 171

Any overlap of the payment term period of any rows with a
shipment number above or any rows below with a shipment
number need to be compared and sum the individual shipment
$ amounts in column (e) where overlap exists.

Thanks,
SAL