The first step is to create a blank workbook with the correct number of blank
worksheets:
Sheet1, Sheet2, ..........
Then run the following macro to rename the sheets:
Sub RenameSheets()
Dim sh As Worksheet
Dim b As String, c As Variant
b = "09_"
c = 1
For Each sh In Worksheets
sh.Name = b & c
c = c + 1
Next
End Sub
Note that _ is used. That is because /\ are not allowed in tab names.