实现VBA自动筛选并进行邮件合并。

代码示例：

Sub MailMerge_Filter() '定义邮件合并字段 Dim MailMergeField As String MailMergeField = "Department"

'设置邮件合并Word文档
Dim wdDoc As Object
Set wdDoc = CreateObject("Word.Application")
wdDoc.Visible = True
wdDoc.Documents.Open "C:\Test.docx"

'设置数据源
Dim ws As Worksheet
Set ws = ThisWorkbook.Sheets("Sheet1")
ws.Activate
ws.ListObjects("Table1").Range.AutoFilter Field:=1

'获取筛选条件
Dim FilterList() As String
FilterList = GetFilterList(ws, MailMergeField)

'依次筛选，并进行邮件合并
Dim i As Integer
For i = 1 To UBound(FilterList)
    ws.ListObjects("Table1").Range.AutoFilter Field:=1, Criteria1:=FilterList(i)
    '进行邮件合并
    wdDoc.MailMerge.MainDocumentType = wdFormLetters
    wdDoc.MailMerge.OpenDataSource "C:\Data.xlsx"
    wdDoc.MailMerge.Destination = wdSendToNewDocument
    wdDoc.MailMerge.Execute
    '关闭数据源
    wdDoc.MailMerge.DataSource.Close
Next i

'清除筛选，并关闭Word文档
ws.ListObjects("Table1").Range.AutoFilter
wdDoc.Close savechanges:=False
Set wdDoc = Nothing

MsgBox "邮件合并完成！"

End Sub

'获取筛选条件函数 Function GetFilterList(ws As Worksheet, fieldName As String) As String() Dim FilterList() As String Dim i As Integer Dim j As Integer Dim FoundMatch As Boolean

j = 1
For i = 2 To ws.Cells(ws.Rows.Count, 1).End(xlUp).Row
    FoundMatch = False
    For Each item In FilterList
        If item = ws.Cells(i, 1).Value Then
            FoundMatch = True
        End If
    Next
    If FoundMatch = False Then
        '加入新条件
        ReDim Preserve FilterList(1 To j)
        FilterList(j) = ws.Cells(i, 1).Value
        j = j + 1
    End If
Next
GetFilterList = FilterList

End Function

说明：

本代码实现了VBA自动筛选并进行邮件合并。

首先定义邮件合并字段，然后设置邮件合并Word文档，接着设置数据源，获取筛选条件，依次筛选，并进行邮件合并。完成后清除筛选，并关闭Word文档。

GetFilterList函数用于获取筛选条件。

注意：本示例代码仅供参考，如需使用请根据实际情况进行修改。