Macro Filter question

[Flora2021]

Hi, I am using a older filter i found online years ago where you enter data on a main sheet, and then run the macro and then the macro will filter and create new sheets based on a criteria.
Then the next time you run it again, it replaces data on those sheets and reads all data. My issue is that i will be using the new sheets it creates to add notes and for tracking purposes.
Is there anyway to keep the macro from overwriting existing data and only add in new data?
Thanks,


Sub FilterCities()
'last edited March 18, 2004
Dim myCell As Range
Dim wks As Worksheet
Dim DataBaseWks As Worksheet
Dim ListRange As Range
Dim dummyRng As Range
Dim myDatabase As Range
Dim TempWks As Worksheet
Dim rsp As Integer
Dim i As Long

'include bottom most header row
Const TopLeftCellOfDataBase As String = "A4"

'what column has your key values
Const KeyColumn As String = "A"

'where's your data
Set DataBaseWks = Worksheets("Main")
i = DataBaseWks.Range(TopLeftCellOfDataBase).Row - 1

rsp = MsgBox("Include headings?", vbYesNo, "Headings")

Set TempWks = Worksheets.Add

With DataBaseWks
Set dummyRng = .UsedRange
Set myDatabase = .Range(TopLeftCellOfDataBase, _
.Cells.SpecialCells(xlCellTypeLastCell))
End With

'rebuild the List
With DataBaseWks
Intersect(myDatabase, .Columns(KeyColumn)).AdvancedFilter _
Action:=xlFilterCopy, _
CopyToRange:=TempWks.Range("A1"), _
Unique:=True

'Add the heading to the criteria area
TempWks.Range("D1").Value = _
.Cells(.Range(TopLeftCellOfDataBase).Row, KeyColumn).Value
End With

With TempWks
Set ListRange = .Range("a2", .Cells(.Rows.Count, "A").End(xlUp))
End With

With ListRange
.Sort Key1:=.Cells(1), Order1:=xlAscending, _
Header:=xlNo, OrderCustom:=1, _
MatchCase:=False, Orientation:=xlTopToBottom
End With

'check for individual City worksheets
For Each myCell In ListRange.Cells
If WksExists(myCell.Value) = False Then
Set wks = Sheets.Add
On Error Resume Next
wks.Name = myCell.Value
If Err.Number <> 0 Then
MsgBox "Please rename: " & wks.Name
Err.Clear
End If
On Error GoTo 0
wks.Move After:=Sheets(Sheets.Count)
Else
Set wks = Worksheets(myCell.Value)
wks.Cells.Clear
End If

If rsp = 6 Then
DataBaseWks.Rows("1:" & i).Copy Destination:=wks.Range("A1")
End If

'change the criteria in the Criteria range
TempWks.Range("D2").Value = "=" & Chr(34) & "=" & myCell.Value & Chr(34)

'transfer data to individual City worksheets
If rsp = 6 Then
myDatabase.AdvancedFilter _
Action:=xlFilterCopy, _
CriteriaRange:=TempWks.Range("D1:D2"), _
CopyToRange:=wks.Range("A2").Offset(i, 0), _
Unique:=False
Else
myDatabase.AdvancedFilter _
Action:=xlFilterCopy, _
CriteriaRange:=TempWks.Range("D1:D2"), _
CopyToRange:=wks.Range("A2"), _
Unique:=False
End If
Next myCell

Application.DisplayAlerts = False
TempWks.Delete
Application.DisplayAlerts = True

MsgBox "Data has been sent"

End Sub
Function WksExists(wksName As String) As Boolean
On Error Resume Next
WksExists = CBool(Len(Worksheets(wksName).Name) > 0)
End Function