I have a report that I want to analyze with Excel, and it's doing
something that's very interesting, but I'm not sure what it is, and I
don't know what you call it. (Note: for confidentiality purposes, I've
blacked out the names of the advisors).

http://i83.photobucket.com/albums/j3...preadsheet.jpg

Take a look at the far left of that image. See how it has those black
lines with the minuses connected to them? If you click on one of the
minuses, everything in between the minus sign and the top of the black
line closes up, and the minus sign turns into a plus. Anyway, my
question is what do you call those black lines with the minuses next
to them, and how do you create something like this in Excel from
scratch?

Also, I'm not sure that this is displaying correctly. To me, it would
almost make more sense to have the minus sign at the top, and not at
the bottom, starting with the location, since the information cascades
from the location, to advisor, to academic program, like thus.

Location
a) Advisor
i. Academic Program

I hope all of this makes sense. It's hard when you're trying to
describe something and you don't even know what the terminology for it
is.