Three column calculations

Take the results of one calculation and use it in a second calculation. This makes it possible to use calculation results in deriving another calculation. Once you use one calculation in another calculation column, you cannot use that result in yet another calculation.  

For example, if Column A + Column B = Column C, and then Column C + Column D = Column E....the Column E results cannot be used in an additional calculation.

Example:

This schedule has three Values SmartColumns -- "Units Sold," "Price Each," and "Target Sales" -- and two Calculation/Indicator SmartColumns -- "Item Sales" and "Target vs. Actual."  

"Item Sales" multiplies "Units Sold" and "Price Each."  "Target vs. Actual" uses the calculation result in "Item Sales" and subtracts the "Target Sales" values.