First post so please bear with me. Ron's code has been a life saver! I need
to add three things to this gem.
Turn off display of msg when saving from xlsx to xls (loosing 2007
formatting is ok).
Prompt to specify name of sheets in new workbooks from "Sheet1" to "Charges".
Prompt for mm-yy suffix to append to file name...like ABC Company 11-08.

Any assistance is greatly appreciated. Thanks for your time.

from Ron de Bruin's tips page:
Sub Copy_To_Worksheets()
Dim CalcMode As Long
Dim ws1 As Worksheet
Dim ws2 As Worksheet
Dim WSNew As Worksheet
Dim rng As Range
Dim cell As Range
Dim Lrow As Long
Dim FieldNum As Integer

'Name of the sheet with your data
Set ws1 = Sheets("Sheet1") '<<< Change

'Set filter range : A1 is the top left cell of your filter range and
'the header of the first column, D is the last column in the filter range
Set rng = ws1.Range("A1:D" & Rows.Count)

'Set Field number of the filter column
'This example filters on the first field in the range(change the field
if needed)
'In this case the range starts in A so Field:=1 is column A, 2 = column
B, ......
FieldNum = 1

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

' Add a worksheet to copy the a unique list and add the CriteriaRange
Set ws2 = Worksheets.Add

With ws2
'first we copy the Unique data from the filter field to ws2
rng.Columns(FieldNum).AdvancedFilter _
Action:=xlFilterCopy, _
CopyToRange:=.Range("A1"), Unique:=True

'loop through the unique list in ws2 and filter/copy to a new sheet
Lrow = .Cells(Rows.Count, "A").End(xlUp).Row
For Each cell In .Range("A2:A" & Lrow)

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

'Firstly, remove the AutoFilter
ws1.AutoFilterMode = False

'Filter the range
rng.AutoFilter Field:=FieldNum, Criteria1:="=" & cell.Value

'Copy the visible data and use PasteSpecial to paste to the new
worksheet
ws1.AutoFilter.Range.Copy
With WSNew.Range("A1")
' Paste:=8 will copy the columnwidth in Excel 2000 and higher
.PasteSpecial Paste:=8
.PasteSpecial xlPasteValues
.PasteSpecial xlPasteFormats
Application.CutCopyMode = False
.Select
End With

'Close AutoFilter
ws1.AutoFilterMode = False

Next cell

'Delete the ws2 sheet
On Error Resume Next
Application.DisplayAlerts = False
.Delete
Application.DisplayAlerts = True
On Error GoTo 0

End With

With Application
.ScreenUpdating = True
.Calculation = CalcMode
End With
End Sub