I need to add an InputBox to the following script to ask me which
column to use to separate the data. Does anyone know how to add the
InputBox.

Sub Copy_With_AdvancedFilter_To_Worksheets()
Dim CalcMode As Long
Dim ws1 As Worksheet
Dim WSNew As Worksheet
Dim rng As Range
Dim cell As Range
Dim Lrow As Long



Set ws1 = Sheets("Sheet1") '<<< Change

'Tip : You can also use a Dynamic range name,
http://www.contextures.com/xlNames01.html#Dynamic
'or a fixed range like Range("A1:H1200")
Set rng = ws1.Range("A1").CurrentRegion '<<< Change



With Application
CalcMode = .Calculation
.Calculation = xlCalculationManual
.ScreenUpdating = False
End With



With ws1
rng.Columns(3).AdvancedFilter _
Action:=xlFilterCopy, _
CopyToRange:=.Range("IV1"), Unique:=True

'This example filter on the first column in the range (change
this if needed)
'You see that the last two columns of the worksheet are used
to make a Unique list
'and add the CriteriaRange.(you can't use this macro if you
use the columns)


Lrow = .Cells(Rows.Count, "IV").End(xlUp).Row
.Range("IU1").Value = .Range("IV1").Value



For Each cell In .Range("IV2:IV" & Lrow)
.Range("IU2").Value = cell.Value

Set WSNew = Sheets.Add
On Error Resume Next
WSNew.Name = cell.Value
If Err.Number 0 Then
MsgBox "Change the name of : " & WSNew.Name & "
manually"
Err.Clear
End If
On Error GoTo 0