That's a good idea, but unfortunately doesn't solve my particular use case. We changed FYs, and have a 3 month stub year, so I need the ability to do custom period range comparisons, since YoY reporting is really rolling 12/13/15 months reporting and not same period last FY (hence standard reports period selections not working for this either). With multiple scenarios of how non-technical resources would want to look at period comparisons, changing the formulas every time is not really feasible. Helpful to know it's definitely not supported though, so I at least know to take a different tack. Thanks!