Excel listing named range in a worksheet and get the value - excel

Question

How to obtain a list of named range exist in a specific worksheet that start with particular string (for example all named range that start with total) and grab the value? I am trying to do Sub Total and Grand Total of accommodation cost based on the date. I will assign an unique name for each Sub Total based on the Date group. Then, I have a button that need to be clicked when it finishes to calculate the Grand Total based on the Named Range that I've assigned uniquely to each Sub Total.
Below is the code I wrote to do the Grand Total:
Sub btnTotal()
Dim Total, LastRowNo As Long
LastRowNo = ActiveSheet.UsedRange.Row + ActiveSheet.UsedRange.Rows.Count
Total = 0
For Each N In ActiveWorkbook.Names
Total = Total + IntFlight.Range(N.Name).Value
Next N
IntFlight.Range("$P" & LastRowNo).Select
Selection.NumberFormat = "$* #,##0.00;$* (#,##0.00);$* ""-""??;#"
With Selection
.Font.Bold = True
End With
ActiveCell.FormulaR1C1 = Total
End Sub
Note: the IntFlight from "Total = Total + IntFlight.Range(N.Name).Value" is the name of my worksheet.
The only problem with above code, it will looking all named range exist in the workbook. I just need to find named range exist in one particular worksheet, which start with given string and the row number (total26: means Sub Total from row 26) and then grab the value to be sum-ed as Grand Total.
Any ideas how to do this? Been spending 2 days to find the answer.
Thanks heaps in advance.
EDIT 1 (Solution Provided by Charles Williams with help from belisarius):
This is what I have done with the code from Charles Williams:
Option Explicit
Option Compare Text
Sub btnIntFlightsGrandTotal()
Dim Total, LastRowNo As Long
LastRowNo = FindLastRowNo("International Flights")
Dim oNM As Name
Dim oSht As Worksheet
Dim strStartString As String
strStartString = "IntFlightsTotal"
Set oSht = Worksheets("International Flights")
For Each oNM In ActiveWorkbook.Names
If oNM.Name Like strStartString & "*" Then
If IsNameRefertoSheet(oSht, oNM) Then
Total = Total + Worksheets("International Flights").Range(oNM.Name).Value
End If
End If
Next oNM
IntFlights.Range("$P" & LastRowNo).Select
Selection.NumberFormat = "$* #,##0.00;$* (#,##0.00);$* ""-""??;#"
With Selection
.Font.Bold = True
End With
ActiveCell.FormulaR1C1 = Total
End Sub
Function FindLastRowNo(SheetName As String) As Long
Dim oSheet As Worksheet
Set oSheet = Worksheets(SheetName)
FindLastRowNo = oSheet.UsedRange.Row + oSheet.UsedRange.Rows.Count
End Function
Thank you all for your help. Now, I need to come up with my own version for this script.

Answer 1

Here is some code that checks if a Defined Name starts with a string and refers to a range within the used range of a given worksheet and workbook.
Option Explicit
Option Compare Text
Sub FindNames()
Dim oNM As Name
Dim oSht As Worksheet
Dim strStartString As String
strStartString = "Total"
Set oSht = Worksheets("TestSheet")
For Each oNM In ActiveWorkbook.Names
If oNM.Name Like strStartString & "*" Then
If IsNameRefertoSheet(oSht, oNM) Then
MsgBox oNM.Name
End If
End If
Next oNM
End Sub
Function IsNameRefertoSheet(oSht As Worksheet, oNM As Name) As Boolean
Dim oSheetRange As Range
IsNameRefertoSheet = False
On Error GoTo GoExit
If Not oSht Is Nothing Then
If Range(oNM.Name).Parent.Name = oSht.Name And _
Range(oNM.Name).Parent.Parent.Name = oSht.Parent.Name Then
Set oSheetRange = oSht.Range("A1").Resize(oSht.UsedRange.Row + oSht.UsedRange.Rows.Count - 1, oSht.UsedRange.Column + oSht.UsedRange.Columns.Count - 1)
If Not Intersect(Range(oNM.Name), oSheetRange) Is Nothing Then IsNameRefertoSheet = True
Set oSheetRange = Nothing
End If
End If
Exit Function
GoExit:
End Function

Answer 2

The following function will output all the names and their totals in your Workbook.
I think it is the basic block you need to get your code running.
Sub btnTotal()
For Each N In ActiveWorkbook.Names
MsgBox N.Name + " " + CStr(Application.WorksheetFunction.Sum(Range(N)))
Next N
End Sub
Edit
Answering your comment:
Define your names in this way:
Then (and only then) the following code works:
Sub btnTotal()
For Each N In ActiveSheet.Names
If (InStr(N.Name, "!Total") <> 0) Then
MsgBox N.Name + " " + CStr(Application.WorksheetFunction.Sum(Range(N)))
End If
Next N
End Sub
If you do not define the scope of the names correctly you need a lot of extra work in your code.
Edit
As you forgot to mention that you are still working with Excel 2003, here you will find an addin to manage name scoping in that version. See screen cap below
HTH