When creating Metrics in Calc Wizard in v9, you can only use functions and arithmetic on fields in your data sources in the calculation. It would be VERY HELPFUL to be able to use other Metrics defined earlier (above this one) in the calculation in the definition of other Metrics in the same calculation. I find myself creating Metric1, then copying the entire thing into Metric2 and adding more calculation steps, then copying the entirety of Metric2 into Metric3 to add even more steps. Being able to reference Metric1 directly as part of the definition of the formula for Metric2 and then reference Metric2 directly in the formula for Metric3 would be very helpful indeed. More than 3 levels of nesting is desired - up to 10 would be nice, or whatever the maximum is for number of metrics in a calc.