Monthly spreadsheet autopopulate master sheet?

pyDataWithoutHeaders()
Dim sh As Worksheet
Dim DestSh As Worksheet
Dim Last As Long
Dim shLast As Long
Dim CopyRng As Range
Dim StartRow As Long

With Application
.ScreenUpdating = False
.EnableEvents = False
End With

' Delete the summary sheet if it exists.
Application.DisplayAlerts = False
On Error Resume Next
ActiveWorkbook.Worksheets("RDBMergeSheet").Delete
On Error GoTo 0
Application.DisplayAlerts = True

' Add a new summary worksheet.
Set DestSh = ActiveWorkbook.Worksheets.Add
DestSh.Name = "RDBMergeSheet"

' Fill in the start row.
StartRow = 2

' Loop through all worksheets and copy the data to the
' summary worksheet.
For Each sh In ActiveWorkbook.Worksheets
If sh.Name <> DestSh.Name Then

' Find the last row with data on the summary
' and source worksheets.
Last = LastRow(DestSh)
shLast = LastRow(sh)

' If source worksheet is not empty and if the last
' row >= StartRow, copy the range.
If shLast > 0 And shLast >= StartRow Then
'Set the range that you want to copy
Set CopyRng = sh.Range(sh.Rows(StartRow), sh.Rows(shLast))

' Test to see whether there are enough rows in the summary
' worksheet to copy all the data.
If Last + CopyRng.Rows.Count > DestSh.Rows.Count

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