Hi Oliver!
Thank you so much for your reply. I really appreciate it!
I tried what you said, however, I am still coming up with a few issues. So when I do as instructed above, it shows up great when you look at it:

But, when I un-select Cost Center Name and then re-select it I get the following:

The hierarchy disappears.
I would love for it to work like it does on Cost Pools where if I un-select Cost Sub Pool I can see just Hardware, Software, etc. alone and then I can re-select Cost Sub Pools and the hierarchy will reappear.
I'm not sure why this doesn't work properly in Waterfall. Any ideas?
If you need more information just let me know.
Thanks for all of your help!!
Molly