LoriSoodThat article shows how to add the Enumerated Constraint on a particular Attribute of a WTPart. As far as i am aware of Enum List. PTC does not provide any Loader to load the Enumerated List.
You probably are way beyond needing this still, but I was able to load enumerations using this load file.
I also used an Excel file to generate this XML, as I never had much luck with the CSV2XML converter.