Format 2 Excel sheets then save both sheets as a new workbook
Most times you have Range.Select followed by Selection.Something you can remove the Select and Selection to leave it Range.Something. This helps clarify what the code is doing. The same may be true of Worksheet.Select (or Activate). But doing this with a worksheet will alter any unqualified Range variables in your code that follows.

Range without VariableName.Range refer to the ActiveSheet and can lead to issues if you're not aware of this. My first step was to go through and everything after Worksheets(2).Select to fully qualify it with

Dim secondSheet As Worksheet
Set secondSheet = Worksheets(2)


Range("AK1").Value = "1" then became secondSheet.Range("AK1").Value = "1" giving me a lot more confidence that removing the .Select shouldn't alter the code. I did the same with Worksheets(1).Select as well. After that I went after the Range.Selects.



Range("N" &amp; Rows.Count).End(xlUp).Select
Range(Selection, Selection.End(xlUp)).Select
Selection.PasteSpecial Paste:=xlPasteAll, Operation:=xlMultiply, _
SkipBlanks:=False, Transpose:=False


I took the above Select and Selection to be finding where the last cell on a specific column. Range("N" &amp; Rows.Count).End(xlUp).Select became what follows. My choice of variable names are self describing, helping you immediately understand what the code is there for.

Dim lastCell as range
set lastCell = secondSheet.Range("N" &amp; Rows.Count).End(xlUp)


Going up from this last cell to get a contiguous range Range(Selection, Selection.End(xlUp)).Select became

Dim modifyRange as Range
Set modifyRange = secondSheet.Range(lastCell, lastCell.End(xlUp))


Lastly replace the Selection in Selection.PasteSpecial Paste:=xlPasteAll, Operation:=xlMultiply, SkipBlanks:=False, Transpose:=False with modifyRange and it's looking a lot better. But this is being done in 3 places on the secondSheet and once on firstSheet. Rather than having duplicated code, create a Sub procedure ConvertToNumeric that takes in 2 parameters ByVal sheetToUse As Worksheet and ByVal columnToFindLastCellOn As String. The names let you know when typing the name ConvertToNumeric&lt;space&gt; and getting intellisense to show you the names of the arguments you'll supply. Any future changes are made in this single location now be reflected wherever it's called at ensuring the update is correct.

Private Sub ConvertToNumeric(ByVal sheetToUse As Worksheet, ByVal columnToFindLastCellOn As String)
    Dim helperCell As Range
    Set helperCell = sheetToUse.Range("AK1")
    helperCell.value = "1"
    helperCell.Copy

    Dim lastCell As Range
    Set lastCell = sheetToUse.Cells(Rows.Count, columnToFindLastCellOn).End(xlUp)

    Dim modifyRange As Range
    Set modifyRange = sheetToUse.Range(lastCell, lastCell.End(xlUp))
    modifyRange.PasteSpecial Paste:=xlPasteAll, Operation:=xlMultiply, SkipBlanks:=False, Transpose:=False

    helperCell.ClearContents
End Sub




You have a few places with comments like 'Format Amount as Accounting that are describing what you're doing. When this occurs it's pretty safe to make that chunk of code be it's own Sub or Function. Sub if it doesn't return a value or Function if it does.

Using the same idea as above Range("J" &amp; Rows.Count).End(xlUp).Select became a Dim lastCell As Range variable and the Range(Selection, Selection.End(xlUp)).Select became Dim modifyRange As Range. You get

Private Sub FormatAsAccounting(ByVal sheetToUse As Worksheet, ByVal columnToApplyFormatTo As String)
    Dim lastCell As Range
    Set lastCell = sheetToUse.Cells(Rows.Count, columnToApplyFormatTo).End(xlUp)

    Dim modifyRange As Range
    Set modifyRange = sheetToUse.Range(lastCell, lastCell.End(xlUp))
    modifyRange.Style = "Comma"
End Sub


It's called in code FormatAsAccounting secondSheet, "J" where secondSheet is a worksheet variable and columnToApplyFormatTo is a string that tells you what column you'll be using. Admittedly the modifyRange variable isn't actually needed and sheetToUse.Range(lastCell, lastCell.End(xlUp)).Style ... could be used but serves to illustrate how as code becomes simpler many times it helps clean itself.

The same thing occurred with headers as well.



When you get to the saving a workbook that has copies of your worksheets you have variables Dim ws As Worksheet that's never used and Dim wbNew As Workbook that's assigned but then never used. There is also dt and wbNam, neither of which are declared. In the VBE coding window go to Tools>Options>Require Variable Declaration. This will put Option Explicit into any new module and requires you to Dim every single variable. It takes more thought and effort to code, but doing something well generally takes effort. Future-you will thank current-you for doing so because it'll save you from many needless issues in your code. BTW Debug>Compile VBAProject (Alt+D+L for keyboard shortcut) is your friend. That'll tell the compiler to compile the code and if something isn't correct it'll alert you by taking you straight there. Keep doing that until there's no more compile-time problems.

Back to the code.

You're selecting a sheet, filtering the sheet, selecting all cells on the sheet to copy that information to a sheet that was just added. This is done for the sheet "PP" and "BK". Those copied sheets are then copied to a new workbook only to be deleted in your current workbook. You can avoid this by creating a new workbook and using that variable.

Dim saveBook As Workbook
Set saveBook = Workbooks.Add


Putting that code into a Sub and having your cursor on the word Add if you press Ctrl+i or Edit>Quick Info you should see Add([Template]) As Workbook appear. This indicates the Add function on the Workbooks collection returns a Workbook object, which coincidentally is what saveBook has been dimensioned as. Right clicking on Add and choosing Definition (3rd from bottom) will take you to the object browser where you can see at the bottom pane what I just described. This gives you a new workbook to use that you'll eventually save where you want. The Object Browser is another topic, but learning to use it will help tremendously.

You can directly copy a sheet by using the Copy procedure on a worksheet object and tell it where to be copied to with either the Before or After argument.

Dim ppSheet As Worksheet
Set ppSheet = Sheets("pp")
ppSheet.Copy Before:=saveBook.Worksheets(1)


As part of your eventual file name dt isn't descriptive. I used monthPriorDate since that's what you're doing with DateAdd. Putting all the pieces together you get SaveExternalCopy.

Private Sub SaveExternalCopy()
    Dim saveBook As Workbook
    Set saveBook = Workbooks.Add

    Dim ppSheet As Worksheet
    Set ppSheet = Sheets("pp")
    ppSheet.UsedRange.AutoFilter field:=31, Criteria1:="Variable1"

    ppSheet.Copy Before:=saveBook.Worksheets(1)
    Dim ppCopy As Worksheet
    Set ppCopy = saveBook.Worksheets(1)
    ppCopy.Name = "PP1"


    Dim bkSheet As Worksheet
    Set bkSheet = Sheets("Bk")
    bkSheet.UsedRange.AutoFilter field:=16, Criteria1:="Variable2"

    bkSheet.Copy After:=ppCopy
    Dim bkCopy As Worksheet
    Set bkCopy = Sheets.Add(After:=bkSheet)
    bkCopy.Name = "BK1"

    Dim monthPriorDate As String
    monthPriorDate = Format(DateAdd("m", -1, Now), "yyyy_mm")

    'Dont forget to delete any default sheets that are created
    'when the workbook is first created.

    saveBook.SaveAs "\\user\location\" &amp; "BK_PP_" &amp; monthPriorDate &amp; ".xlsx"
    saveBook.Close
End Sub




My final code ended up as follows. Save a copy before running the code as I've not 100% fully tested everything and there might be an unforseen issue that wasn't caught.

PP_Formatting_Saving now is shorter and everything it's doing is self-descriptive. Each Sub that's called is doing one thing, which makes it easier to fix a problem when looking at 10-20 lines of code instead of a single block of around 90 lines of code. Comments are mostly gone. Comments should describe the why of something being done not the what since what is happening should be apparent. Why is for when one choice was made over another, something like 'Doing it this way over &lt;OtherWaysName&gt; is 5 times faster.

Public Sub PP_Formatting_Saving()

    Application.ScreenUpdating = False

    Dim secondSheet As Worksheet
    Set secondSheet = Worksheets(2)
    secondSheet.Select 'This may possible be removable

    ConvertToNumeric secondSheet, "N"
    ConvertToNumeric secondSheet, "AA"
    ConvertToNumeric secondSheet, "G"

    FormatAsAccounting secondSheet, "J"
    FormatTheHeaderOf secondSheet

    secondSheet.Cells.EntireColumn.AutoFit
    secondSheet.Columns("O:O").ColumnWidth = 40
    secondSheet.Cells.AutoFilter '¿Does this turn it on or off? 'Filter all headers

    Dim firstSheet As Worksheet
    Set firstSheet = Worksheets(1)
    firstSheet.Activate 'This may possible be removable also
    firstSheet.Cells.WrapText = False

    FormatAsAccounting firstSheet, "C"
    ConvertToNumeric firstSheet, "B"
    firstSheet.Cells.EntireColumn.AutoFit
    FormatTheHeaderOf firstSheet
    firstSheet.Cells.AutoFilter

    SaveExternalCopy
End Sub

Private Sub ConvertToNumeric(ByVal sheetToUse As Worksheet, ByVal columnToFindLastCellOn As String)
    Dim helperCell As Range
    Set helperCell = sheetToUse.Range("AK1")
    helperCell.value = "1"
    helperCell.Copy

    Dim lastCell As Range
    Set lastCell = sheetToUse.Cells(Rows.Count, columnToFindLastCellOn).End(xlUp)

    Dim modifyRange As Range
    Set modifyRange = sheetToUse.Range(lastCell, lastCell.End(xlUp))
    modifyRange.PasteSpecial Paste:=xlPasteAll, Operation:=xlMultiply, SkipBlanks:=False, Transpose:=False

    helperCell.ClearContents
End Sub

Private Sub FormatTheHeaderOf(ByVal sheetToUse As Worksheet)
    Dim header As Range
    Set header = sheetToUse.Range(sheetToUse.Range("A1"), sheetToUse.Range("A1").End(xlToRight))
    With header.Interior
        .Pattern = xlSolid
        .PatternColorIndex = xlAutomatic
        .Color = RGB(192, 192, 192) 'RGB(192,192,192) = 12632256
        .TintAndShade = 0
        .PatternTintAndShade = 0
    End With
    header.Font.Bold = True
End Sub

Private Sub FormatAsAccounting(ByVal sheetToUse As Worksheet, ByVal columnToApplyFormatTo As String)
    Dim lastCell As Range
    Set lastCell = sheetToUse.Cells(Rows.Count, columnToApplyFormatTo).End(xlUp)

    Dim modifyRange As Range
    Set modifyRange = sheetToUse.Range(lastCell, lastCell.End(xlUp))
    'NumberFormat could possibly be used instead of Style
    'I'm not sure if you have altered the "Comma" Style though
    'modifyRange.NumberFormat = "_(* #,##0.00_);_(* (#,##0.00);_(* ""-""??_);_(@_)"
    modifyRange.Style = "Comma"
End Sub

Private Sub SaveExternalCopy()
    Dim saveBook As Workbook
    Set saveBook = Workbooks.Add

    Dim ppSheet As Worksheet
    Set ppSheet = Sheets("pp")
    ppSheet.UsedRange.AutoFilter field:=31, Criteria1:="Variable1"

    ppSheet.Copy Before:=saveBook.Worksheets(1)
    Dim ppCopy As Worksheet
    Set ppCopy = saveBook.Worksheets(1)
    ppCopy.Name = "PP1"


    Dim bkSheet As Worksheet
    Set bkSheet = Sheets("Bk")
    bkSheet.UsedRange.AutoFilter field:=16, Criteria1:="Variable2"

    bkSheet.Copy After:=ppCopy
    Dim bkCopy As Worksheet
    Set bkCopy = Sheets.Add(After:=bkSheet)
    bkCopy.Name = "BK1"

    Dim monthPriorDate As String
    monthPriorDate = Format(DateAdd("m", -1, Now), "yyyy_mm")

    'Dont forget to delete any default sheets that are created
    'when the workbook is first created.

    saveBook.SaveAs "\\user\location\" &amp; "BK_PP_" &amp; monthPriorDate &amp; ".xlsx"
    saveBook.Close
End Sub


Lastly Rubberducks Code Inspections brought up a lot of what I addressed and has been very helpful to my VBA knowledge and improving my coding habits. I'm a contributor and openly biased in favor of it.