Sum range for all worksheets starting with a specifc name

In Worksheet.Name of "Main" in cell "K1", I need a formula that will give me the sum of all ranges A11:B12 on all worksheets with a name like "Series*".  

If my sheet names for "Series" remained static, I could use a formula like this:
=SUM(Series1_AA:Series9_AA!A11:B12)+SUM(SeriesA_AA:SeriesZ_AA!A11:B12)

But the problem is, these sheet names change regularly.  So one day my formula may need to be:
=SUM(Series1_BB:Series9_BB!A11:B12)+SUM(SeriesA_BB:SeriesZ_BB!A11:B12) OR
=SUM(Series1_CC:Series9_CC!A11:B12)+SUM(SeriesA_CC:SeriesZ_CC!A11:B12)

The one thing that remains consistent is the "Series" portion of the name.  I'm guess there a way that this can be done through VBA.  I'm open to any suggestions.  Thanks!



KP_SoCalAsked:
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calacucciaConnect With a Mentor Commented:
Put this formula where you want the result

=SeriesSum(AA11:B12)


And create this VBA Function

Function SumSeries(myRange As Range) As Variant
Dim rStr As String
Dim sh As Worksheet

rStr = myRange.Address

For Each sh In ThisWorkbook.Worksheets
    If Left(sh.Name, 6) = "Series" Then SumSeries = SumSeries + Application.WorksheetFunction.Sum(sh.Range(rStr))
Next sh

End Function

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KP_SoCalAuthor Commented:
Great!  Just what I needed, thanks so much!!!
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calacucciaCommented:
KP_SoCal:

You're welcome, thanks for the grade.
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byundtCommented:
I realize that the question has already been answered, but you will probably encounter problems getting the user-defined function to refresh its results. If a user changes the name of a worksheet or inserts a new one into an existing workbook, the function will not update.

Workaround #1: Make the function volatile. Add the following statement right after your Dim statements:
Application.Volatile             'Function will recalculate after any change in any cell values. May make workbook sluggish if you use it in many places.

Workaround #2: Add a dummy parameter, and change the value of that parameter whenever you want the function to recalculate.
=SeriesSum(AA11:B12, $Z$1)                       'Z1 contains a dummy parameter which is not used in calculations. Changing it forces SeriesSum to recalculate

Brad

Function SumSeries(myRange As Range, Dummy As Variant) As Variant
Dim rStr As String
Dim sh As Worksheet

rStr = myRange.Address

For Each sh In ThisWorkbook.Worksheets
    If Left(sh.Name, 6) = "Series" Then SumSeries = SumSeries + Application.WorksheetFunction.Sum(sh.Range(rStr))
Next sh

End Function

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KP_SoCalAuthor Commented:
Brad, this is outstanding.  I'm going to go with workaround #2 to avoid using the volatile function due to the size of my actual spreadsheet.  I really appreciate this extra bit of information.  Have a great weekend and thanks again for the extra mile on this. ;-)
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calacucciaCommented:
Thanks for follow-up Brad, I should have added that myself, but was to much in a hurry and it's been a while since I created a UDF :-)
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