I have modified this code for better explanation and error handling (includes a function to check if a worksheet exists or not). To run this code follow these steps:
1. Insert a new module in your workbook,
2. Copy and paste this code,
3. Go back to worksheet with data in it,
4. Press Alt + F8 to bring the macro window
5. Select this procedure and hit run
6. Enter the new worksheet name in the input box
7. If everything went well, you should have a new worksheet with all the data from original worksheet in one column with the column headers. See the screen shots for example.
Before stacking-the original data:

After stacking:

Here’s the code:
Option Explicit Sub Stack_cols() On Error GoTo Stack_cols_Error Dim lNoofRows As Long, lNoofCols As Long Dim lLoopCounter As Long, lCountRows As Long Dim sNewShtName As String Dim shtOrg As Worksheet, shtNew As Worksheet 'Turn off the screen update to make macro run faster Application.ScreenUpdating = False 'Ask for a new sheet name, if not provided use newsht sNewShtName = InputBox("Enter the new worksheet name", "Enter name", "newsht") 'Set a sheet variable for the sheet where the data resides Set shtOrg = ActiveSheet 'Add a new worksheet, rename it and set it to a variable If Not SheetExists(sNewShtName) Then Worksheets.Add(After:=Worksheets(Worksheets.Count)).Name = sNewShtName Set shtNew = Worksheets(sNewShtName) Else MsgBox "Worksheet name exists. Try again", vbInformation, "Sheet Exists" Exit Sub End If With shtOrg 'Get the last column number 'Replace .Range("IV1") with .Range("XFD1") for Excel 2007 lNoofCols = .Range("IV1").End(xlToLeft).Column 'Start a loop to copy and paste data from the first column to the last column For lLoopCounter = 1 To lNoofCols 'Count the number of rows in the looping column 'Replace .Cells(65536, lLoopCounter) with .Cells(1048576, lLoopCounter) for Excel 2007 lNoofRows = .Cells(65536, lLoopCounter).End(xlUp).Row .Range(.Cells(1, lLoopCounter), .Cells(lNoofRows, lLoopCounter)).Copy Destination:=shtNew.Range(shtNew.Cells(lCountRows + 1, 1), shtNew.Cells(lCountRows + lNoofRows, 1)) 'count the number of rows in the new worksheet lCountRows = lCountRows + lNoofRows Next lLoopCounter End With On Error GoTo 0 SmoothExit_Stack_cols: Application.ScreenUpdating = True Exit Sub Stack_cols_Error: MsgBox "Error " & Err.Number & " (" & Err.Description & ") in Sub:Stack_cols" Resume SmoothExit_Stack_cols End Sub 'Check if a worksheet exists or not Public Function SheetExists(sShtName As String) As Boolean On Error Resume Next Dim wsSheet As Worksheet, bResult As Boolean bResult = False Set wsSheet = Sheets(sShtName) On Error GoTo 0 If Not wsSheet Is Nothing Then bResult = True End If SheetExists = bResult End Function
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