Occasionally, it's helpful to be able to create a view column that takes advantage of the calculations already done in other view columns. Let's suppose you have a number in column A, and a number in column B, one or both of which is calculated by a formula in the view column. You want to display their total in column C without having to repeat any complex formulas.
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There's a little known feature that will let you do this. In the propeller head tab of the view column properties, there's a field that'll let you enter a column name. For a formula column, Domino Designer will automatically generate a name such as "$5." To use the value from this column in other columns, you need to change this to a name that's a legal variable, e.g. "columnA." After giving names to columns A and B, you can write the formula for column C as follows.
columnA + columnB