Their seems to be no option to remove sorting. The first sort column is required.

@MjDeck
Is deleting the parts list the only way to remove the parts list sort and have it once again follow the BOM sort order? The following seems to have some unintended behavior. It looks like there might be a method missing to match the UI?
Dim DrawDoc As DrawingDocument = ThisDoc.Document
Dim PartsList As PartsList = DrawDoc.ActiveSheet.PartsLists.Item(1)
Try
PartsList.Sort("ITEM",False,"ITEM",False)
Catch
MessageBox.Show("Error Sorting Partlist", "iLogic")
End Try

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Regards
Alan