User blog comment:DYBAD/Character Sheet/@comment-26210042-20141003064709/@comment-4867780-20141003072923

Nice trick, isn't it ? ^ ^ Special thanks to Blackwings for teaching me this one. :)

You have to use the "source" mode of the editing mode, and sandwich the area you want to open/close between two special texts:

(before the area)

(after the area)

It's a bit tricky at first, but real easy after a few tries. Well, except when you pile them up like I did on this blog, it tends to become complicated if you're not careful.