Question : #tables always in tempdb only?

When we create temp tables in user tables, are they still created in tempdb only?

Answer : #tables always in tempdb only?

OK, to set the named range to an external workbook, try this code:

Be sure to change the filepath to where your "ACA Week x" workbooks are located in this line:

filePath = "C:\"

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Sub CreateNamedRangesExtWbk()
'Create Named Range in External Workbook
    
    Dim wb As Workbook
    Dim filePath As String
    Dim currentWbk As String
    
    filePath = "C:\"
    
    Application.ScreenUpdating = False
    currentWbk = ActiveWorkbook.Name
    
    For i = 1 To 52
        Set wb = Workbooks.Open(filePath & "ACA Week " & i)
        Workbooks(currentWbk).Names.Add Name:="Tails" & i, RefersTo:=wb.Worksheets("TailAvailability").Range("$C$6:$R$204")
        wb.Close False
        Set wb = Nothing
    Next

    Application.ScreenUpdating = True
    
    MsgBox "Named Ranges have been set!"

End Sub