The article you found is about Word 2007 and does not deal with the field I am talking about. Again, what kind of bar code are you trying to insert?

Apparently the commands you found are available in Word 2007-2010 but have to do with an ID barcode for a document. Is that what you want? If so, I expect you are going to have to find policy writing ability.

If you want a bar code for other purposes, though, the Word 2013 fields should suit.