Thank you for sending the print example. It is very helpful. Bajo is indeed a subentry as you have shown.
See Braille Formats Rule 5 section 2e for the swung dash. There is a distinction made if the swung dash is lightface (which I interprete to be regular typeface) or boldface. I didn't know this myself and I was unable to determine from the print page whether your swung dash is bold or not. It kind of looks like bold, but I'm not sure. You can probably tell yourself from the actual print. If not, take your best guess. Don't forget to list this as a Special Symbol. Follow print for spacing. It looks like a space before and after in your print.
Lightface swung dash is [braille].-- and boldface is [braille]_.--