Option Explicit
Public Sub main()
Dim Sh1 As Worksheet, Sh2 As Worksheet
Dim y As Long, x As Long, y2 As Long
Dim s As String
'дубликаты
Set Sh1 = ThisWorkbook.Worksheets("Лист1")
x = Sh1.Columns("G").Column
'цель
Set Sh2 = ThisWorkbook.Worksheets("Лист2")
y2 = 2
Application.ScreenUpdating = False
Dim oDict As Object
Set oDict = CreateObject("Scripting.Dictionary")
For y = 2 To Sh1.Cells(Sh1.Rows.Count, 1).End(xlUp).Row
s = Sh1.Cells(y, x)
If Not oDict.Exists(s) Then
oDict.Add s, y
Else
Sh1.Rows(y).Copy Sh2.Cells(y2, 1)
y2 = y2 + 1
End If
Next
Application.ScreenUpdating = True
Set oDict = Nothing
End Sub