I believe you are asking how to braille the illustration of the "New Groups Below" method that's shown on the print page you attached.
There is not a specific Nemeth rule for this situation. I would suggest using the "carried number indicator" (explained in Nemeth Code §178.d) much as you would for the "New Groups Above" method. Attached is an image of the braille I might use.
You should include a transcriber's note explaining that "the numbers printed on the separation line are brailled between the separation line and the carried number indicator".
edited by kdejute on 9/5/2015