EXCEL - Merge duplicate and append unique Cells

I have a listing of thousands of lines that are duplicate base off some unique primary cells.  There are some other cells that are unique.  I would like to append/combine these cells.  Is this possible?

I am attaching an example with the raw data and final output.  Not sure if Excel can do this or some VBA script can?

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holemaniaAuthor Commented:
The primary key/column would be A and B in this case.  A and B will be the same, but column C and D changes.  I want to remove duplicate and then just append column C and D with a comma separating them.
Option Explicit

Sub kTest()
    Dim dic As Object, i As Long, s As String
    Dim k, kk(), n As Long, c As Long
    Const SheetName As String = "Sheet2"      '<<<<<< adjust the sheet name
    Set dic = CreateObject("scripting.dictionary")
        dic.comparemode = 1
    With ThisWorkbook.Worksheets(SheetName)
        k = .Range("a1").CurrentRegion.Value2
        ReDim kk(1 To UBound(k, 1), 1 To UBound(k, 2))
        For i = 2 To UBound(k, 1)
            s = vbNullString
            s = k(i, 1) & "|" & k(i, 2) 'col a & b
            If Len(s) Then
                If Not dic.exists(s) Then
                    n = n + 1
                    For c = 1 To UBound(k, 2)
                        kk(n, c) = k(i, c)
                    dic.Item(s) = n
                    c = dic.Item(s)
                    kk(c, 3) = kk(c, 3) & ", " & k(i, 3) 'update col c
                    kk(c, 4) = kk(c, 4) & ", " & k(i, 4) 'update col d
                End If
            End If
        If n Then
            .Range("a2").Resize(n, UBound(kk, 2)).Value = kk
        End If
    End With
End Sub

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holemaniaAuthor Commented:
Awesome.  Works perfectly.
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