如果你只是想让程序在“ExportToWorkbooks”（第二个）之后运行第一个“Sub parse_data（）”，或者与第二个“ExportToWorkbooks”（第二个）协同工作，那么你可以将第一个“Sub parse_data（）”中的字段ws更改为参数，并在添加的每个Workbook上调用它。
只有两行是必需的：

Sub parse_data(ws As Worksheet)

Call parse_data (dws)

并注解掉该行：

Set ws = ActiveSheet

因为在调用 parse_data（） 过程时，已经将其设置为当前处理的工作表。
所以你的代码将是：

Sub parse_data(ws As Worksheet)
    Dim lr As Long
'    Dim ws As Worksheet
    Dim vcol, i As Integer
    Dim icol As Long
    Dim myarr As Variant
    Dim title As String
    Dim titlerow As Integer

    'This macro splits data into multiple worksheets based on the variables on a column found in Excel.
    'An InputBox asks you which columns you'd like to filter by, and it just creates these worksheets.

    Application.ScreenUpdating = False
    vcol = Application.InputBox(prompt:="Which column would you like to filter by?", title:="Filter column", Default:="3", Type:=1)
'    Set ws = ActiveSheet
    lr = ws.Cells(ws.Rows.Count, vcol).End(xlUp).Row
    title = "A1"
    titlerow = ws.Range(title).Cells(1).Row
    icol = ws.Columns.Count
    ws.Cells(1, icol) = "Unique"
    For i = 2 To lr
        On Error Resume Next
        If ws.Cells(i, vcol) <> "" And Application.WorksheetFunction.Match(ws.Cells(i, vcol), ws.Columns(icol), 0) = 0 Then
            ws.Cells(ws.Rows.Count, icol).End(xlUp).Offset(1) = ws.Cells(i, vcol)
        End If
    Next

    myarr = Application.WorksheetFunction.Transpose(ws.Columns(icol).SpecialCells(xlCellTypeConstants))
    ws.Columns(icol).Clear

    For i = 2 To UBound(myarr)
        ws.Range(title).AutoFilter Field:=vcol, Criteria1:=myarr(i) & ""
        If Not Evaluate("=ISREF('" & myarr(i) & "'!A1)") Then
            Sheets.Add(After:=Worksheets(Worksheets.Count)).Name = myarr(i) & ""
        Else
            Sheets(myarr(i) & "").Move After:=Worksheets(Worksheets.Count)
        End If
        ws.Range("A" & titlerow & ":A" & lr).EntireRow.Copy Sheets(myarr(i) & "").Range("A1")
        'Sheets(myarr(i) & "").Columns.AutoFit
    Next

    ws.AutoFilterMode = False
    ws.Activate
    Application.ScreenUpdating = True
End Sub

Sub ExportToWorkbooks()
    
    Const aibPrompt As String = "Which column would you like to filter by?"
    Const aibtitle As String = "Filter Column"
    Const aibDefault As Long = 3
    
    Dim dFileExtension As String: dFileExtension = ".xlsx"
    Dim dFileFormat As XlFileFormat: dFileFormat = xlOpenXMLWorkbook
    Dim dFolderPath As String: dFolderPath = "C:\Test\"
    
    If Right(dFolderPath, 1) <> "\" Then dFolderPath = dFolderPath & "\"
    If Len(Dir(dFolderPath, vbDirectory)) = 0 Then Exit Sub ' folder not found
    If Left(dFileExtension, 1) <> "." Then dFileExtension = "." & dFileExtension
    
    Application.ScreenUpdating = False
    
    Dim sCol As Variant
    sCol = Application.InputBox(aibPrompt, aibtitle, aibDefault, , , , , 1)
    If Len(CStr(sCol)) = 0 Then Exit Sub ' no entry
    If sCol = False Then Exit Sub ' canceled
    
    Dim sws As Worksheet: Set sws = ActiveSheet
    If sws.AutoFilterMode Then sws.AutoFilterMode = False ' turn off AutoFilter
    Dim srg As Range: Set srg = sws.Range("A1").CurrentRegion
    Dim srCount As Long: srCount = srg.Rows.Count
    If srCount < 3 Then Exit Sub ' not enough rows
    Dim srrg As Range: Set srrg = srg.Rows(1) ' to copy column widths
    Dim scrg As Range: Set scrg = srg.Columns(sCol)
    Dim scData As Variant: scData = scrg.Value
    
    ' Write the unique values from the 1st column to a dictionary.
    
    Dim dict As Object: Set dict = CreateObject("Scripting.Dictionary")
    dict.CompareMode = vbTextCompare ' case insensitive
    
    Dim Key As Variant
    Dim r As Long
    
    For r = 2 To srCount
        Key = scData(r, 1)
        If Not IsError(Key) Then ' exclude error values
            If Len(Key) > 0 Then ' exclude blanks
                dict(Key) = Empty
            End If
        End If
    Next r
    If dict.Count = 0 Then Exit Sub ' only error values and blanks
    Erase scData
    
    Dim dwb As Workbook
    Dim dws As Worksheet
    Dim dfcell As Range
    Dim dFilePath As String
    
    For Each Key In dict.Keys
        ' Add a new (destination) workbook and reference the first cell.
        Set dwb = Workbooks.Add(xlWBATWorksheet) ' one worksheet
        Set dws = dwb.Worksheets(1)
        Set dfcell = dws.Range("A1")
        ' Copy/Paste
        srrg.Copy
        dfcell.PasteSpecial xlPasteColumnWidths
        srg.AutoFilter sCol, Key
        srg.SpecialCells(xlCellTypeVisible).Copy dfcell
        sws.ShowAllData
        dfcell.Select
        ' Save/Close
        dFilePath = dFolderPath & Key & dFileExtension ' build the file path
        Application.DisplayAlerts = False ' overwrite without confirmation
        

        'save file Just in case
        dwb.SaveAs dFilePath, xlOpenXMLWorkbook
        Call parse_data (dws)

        
        'save it again prepaer to close
        dwb.SaveAs dFilePath, xlOpenXMLWorkbook
        Application.DisplayAlerts = True
        dwb.Close SaveChanges:=False
    Next Key
    
    sws.AutoFilterMode = False
    Application.ScreenUpdating = True
    
    MsgBox "Data exported.", vbInformation
    
End Sub