Using miadmin... This script will help you.
1. Under the "Action" column use this formula.
=IF(X7=X8,"","MODIFY_PART_NUMBER")
This seperates out the same item_GUID from its seperate versions
2. Use this (or similar code) to add a six digit prefix to your part numbers.
Sub AddPartNumberandName()
NumRows = ActiveSheet.UsedRange.Rows.Count ' Counts rows in sheet
Number = 100000 ' Whatever unique item identifier you want.
x = 7 ' this is where miadmin spits out the data
Cells(1, 1).Select
For x = 7 To NumRows
Cells(x, 8).Select
If Cells(x, 9) <> "" Then Cells(x, 8).Select
ActiveCell.FormulaR1C1 = "test." & Number & Cells(x, 4).Value Number = Number + 1
Else
End If
Next x
Cells(1, 1).Select
End Sub