Help Writing Excel Macro

The Data worksheet is how my data is formatted.  There are an known number of rows, some could have 100, 3, or 1000.  The macro needs to loop until end of last row.

On the Result worksheet, it's stringing together all the similar part numbers.

Check the attached xls for an example. example.xls
michaelblitzAsked:
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Patrick MatthewsCommented:
michaelblitz,

The following seems to be working for me.  It uses a "Dictionary of Dictionaries" approach as outlined in my article http://www.experts-exchange.com/Software/Office_Productivity/Office_Suites/MS_Office/A_3391-Using-the-Dictionary-Class-in-VBA.html

Sub MakeLists()
    
    Dim dicFront As Object
    Dim dicRear As Object
    Dim dicSecond As Object
    Dim arr As Variant
    Dim r As Long
    Dim LastR As Long
    Dim Make As String
    Dim Model As String
    Dim Years As Variant
    Dim Front As String
    Dim Rear As String
    Dim Concat As String
    Dim Entries As Variant
    
    With ThisWorkbook.Worksheets("Data")
        LastR = .Cells(.Rows.Count, "a").End(xlUp).Row
        arr = .Range(.[a2], .Cells(LastR, "g")).Value
    End With
    
    Set dicFront = CreateObject("Scripting.Dictionary")
    Set dicRear = CreateObject("Scripting.Dictionary")
    
    For r = 1 To UBound(arr, 1)
        Make = arr(r, 1)
        Model = Trim(arr(r, 2) & " " & arr(r, 3))
        Years = Split(arr(r, 4) & "-", "-")
        Concat = Join(Array(Make, Model, Years(0), Years(1)), "|")
        Front = arr(r, 6)
        Rear = arr(r, 7)
        If Front <> "" Then
            If dicFront.Exists(Front) Then
                Set dicSecond = dicFront.Item(Front)
            Else
                Set dicSecond = CreateObject("Scripting.Dictionary")
                dicFront.Add Front, dicSecond
            End If
            dicSecond.Item(Concat) = Concat
        End If
        If Rear <> "" Then
            If dicRear.Exists(Rear) Then
                Set dicSecond = dicRear.Item(Rear)
            Else
                Set dicSecond = CreateObject("Scripting.Dictionary")
                dicRear.Add Rear, dicSecond
            End If
            dicSecond.Item(Concat) = Concat
        End If
    Next
    
    ThisWorkbook.Worksheets.Add
    [a1] = "Front"
    LastR = 1
    Entries = dicFront.Keys
    For r = 0 To UBound(Entries)
        LastR = LastR + 1
        Cells(LastR, 1) = Entries(r)
        Cells(LastR, 2) = Join(dicFront.Item(Entries(r)).Keys, "###")
    Next
    
    LastR = LastR + 2
    Cells(LastR, 1) = "Rear"
    Entries = dicRear.Keys
    For r = 0 To UBound(Entries)
        LastR = LastR + 1
        Cells(LastR, 1) = Entries(r)
        Cells(LastR, 2) = Join(dicRear.Item(Entries(r)).Keys, "###")
    Next
    
    Set dicSecond = Nothing
    Set dicFront = Nothing
    Set dicRear = Nothing
    
    MsgBox "Done"
    
End Sub

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Patrick
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Shinesh PremrajanEngineering ManagerCommented:
This created for the  row 7 of the work sheet, apply same for the rest of the cells

=CONCATENATE(Data!A7,"|",Data!B7," ",Data!C7,"|",REPLACE(Data!D7,5,1,"|"))


Hope this helps
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michaelblitzAuthor Commented:
Hi matthewspatrick

Very nice but only one critic, right now you're using Front AND Rear to determine uniqueness.  Instead, it should be Front OR Rear.  For example,

A, B
A,
A, C
A, D

In your code you'd show 4 unique but in reality it's 1 unique front and 3 unique rears.  Did that make sense?  :)
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michaelblitzAuthor Commented:
Oh wait nevermind my mistake :)
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Patrick MatthewsCommented:
michaelblitz,

Glad to help!  If you have not already done so, I would really appreciate it if you could please return to my article
http://www.experts-exchange.com/Software/Office_Productivity/Office_Suites/MS_Office/A_3391-Using-the-Dictionary-Class-in-VBA.html
and click 'Yes' for the 'Was this helpful?' voting.

Patrick
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