Vlookup and sumif

I have two workbooks.
Workbook One is called Summary and is located at C:\Month. I have a tab labeled MS Aug. In MS Aug column A represents the account number. An example of an account number would be 4025RM28 (there are many more account numbers beginning with 4025.) In the same tab column G represents a balance in for each different 4025 account.
Workbook Two is called CD Spreadsheets. In CD Spreadsheets I have a tab labeled #20. In cell L5 I need to sum all the values from the Summary workbook, where the first four digits are “4025” from the Summary workbook from A3:A640 and place that sum in L5 in the tab labeled #20.
In other words, in the CD Spreadsheets at L5 go to the Summary workbook, tab MS Aug and add all the values in column G where the first four digits in column A = 4025 in the Summary workbook tab MS Aug.
Frank FreeseAsked:
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barry houdiniCommented:
Oh, apologies! I left out a parenthesis at the beginning - should be like this

=SUMPRODUCT((LEFT('[Summary.xls]MS Aug'!A$3:A$640,4)="4025")+0,'[Summary.xls]MS Aug'!G$3:G$640)

regards, barry
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barry houdiniCommented:
Hello fh freese

Normally this can be done with SUMIF function and a wildcard but if the source workbook might be closed SUMIF won't work so SUMPRODUCT might be the best bet...try this formula in L5

=SUMPRODUCT(LEFT('[Summary.xls]MS Aug'!A$3:A$640,4)="4025")+0,'[Summary.xls]MS Aug'!G$3:G$640)

regards, barry
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Frank FreeseAuthor Commented:
barry,
got an error at G$640
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Frank FreeseAuthor Commented:
no error now? but no values, yet - off to the dentist but check out tonight
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Frank FreeseAuthor Commented:
sorry barry, still getting error
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barry houdiniCommented:
Note: I assume initially that you will have both workbooks open - then the above formula should work. If you then close the Summary workbook the formula will change automatically to show the whole path for Summary .....and the result will still display.

regards, barry
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Frank FreeseAuthor Commented:
I think I got it!
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Frank FreeseAuthor Commented:
thank you!
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