Run vba script without opening macro file

Hello guys,
I hope you are all fine.
I am a totally vba newbie with little enquiries.
Could i launch my vba script without the need of opening two of my files simultaneously(a macro file holding the code, and a file named "o" where columns are extracted). Since if i don't open both files i would receive a message (error 9: subscript out of range)
Also, in case the workbooks that are generated had already exist, i dont want to receive a message stating to replace it? i prefer to replace it right away with the new one without notice...
I am thankful for any kind amendment to my below code, or any advice.
God bless you

 Sub test()
    Dim rg As Range, i As Long, wb As Workbook
    Dim vNames As Variant, v As Variant
    
    Set rg = Workbooks("o.csv").Worksheets("o").UsedRange
    
    'get unique names
    With CreateObject("Scripting.Dictionary")
        For i = 2 To rg.Rows.Count
            .Item(rg.Cells(i, 1).Value) = Empty
        Next i
        vNames = .keys
    End With

    Application.ScreenUpdating = False
    For Each v In vNames
        ThisWorkbook.Worksheets("Sheet1").Copy
        Set wb = ActiveWorkbook
        wb.SaveAs v, 51
        rg.AutoFilter 1, v
        rg.Offset(1).Columns("A").SpecialCells(xlCellTypeVisible).Copy wb.Worksheets(1).Cells(2, 2)
        rg.Offset(1).Columns("U").SpecialCells(xlCellTypeVisible).Copy wb.Worksheets(1).Cells(2, 11)
        rg.Offset(1).Columns("Q").SpecialCells(xlCellTypeVisible).Copy wb.Worksheets(1).Cells(2, 13)
    With Worksheets("Sheet1")
        With .Range("B2:N1014")
            .Font.Size = 16
            .Font.Name = "Times New Roman"
            .HorizontalAlignment = xlCenter
            .VerticalAlignment = xlCenter
        End With
        .Columns("C:C").Locked = False
        .Protect
        .EnableSelection = xlUnlockedCells
    End With
        wb.SaveAs ThisWorkbook.Path & "\" & v
        wb.Close
    Next v
    Application.ScreenUpdating = True
    MsgBox "Finished process."
End Sub

- To read from a file you need to open it, copy what you need and then close it again. All this could be done by macro.
- To avoid messages just use the function Application.DisplayAlerts = False before the line of Saving code and Application.DisplayAlerts = True just after Saving or just before Ending the Sub.