Can anyone direct me to some training, documentation, on-line video on how to create R12 Waterfall Charts?

R12 waterfall charts are similar to R11 waterfall charts:

How To: Work with Waterfall Charts (Outdated, click for updated version) 

...but keep in mind each R12 waterfall chart is editable on only one environment (DEV, STG, or PRD), selectable via:

(top) Ribbon > Waterfall > Environment

The most common use case will be Production (PRD) to allow end users to directly edit the waterfall chart (by manually entering variance amounts and explanations).

Still trying to figure these out ... so, you configure the waterfall as "Development" until you're ready to check it in and promote, at which point you configure it as "Production"?

When in development (and waterfall is configured as "Development") I should be able to see the behavior that I'll get in production when I change the configuration to "Production" and promote there?

(I don't seem to have the ability to enter causals in Development when configure to Development. Do I need to check it in before testing? )

Created a question for this followup Waterfall Chart Configuration