Hello Don,
Welcome to the forum!
From your code it appears that the parts are in column "A" of the "Parts_Tracker" worksheet. Assuming you want to add a new part at the end of the column if it does not exist then this code should work for you.
Dim Found As Range
Dim Rng As Range
' Start with cell A2, in case A1 is header.
Set Rng = Sheets("PARTS_TRACKER").Range("A2", Cells(Rows.Count, "A").End(xlUp))
' Look for the part in column "A".
Set Found = Rng.Find(Me.ComboBox1.Value, , xlValues, xlWhole, xlByRows, xlNext, False, False, False)
' Add the value if it is missing to the next empty row below the range.
If Found Is Nothing Then
Rng.Cells(Rng.Rows.Count + 1, 1).Value = Me.ComoBox1.Value
End If
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