Properties can store data entered manually or via upload, or the value can be calculated from other Properties within the same step. Calculated Properties are generated during data export and are denoted in Design mode by a "f(x)" to the left of the Property name.
To configure a Calculated Property, add a Property to a step and then click the formula icon to the the right of the Property name. This will open the "Create/Edit Property" modal which allows you to specify the formula used for the Calculated Property. Step 2 of the "Riffyn: Measure Absorbance" process contains a formula for "Dilution Factor":
Formulas for Calculated Properties are built from other Properties within the same step. Each Property is assigned a variable name, with variable names being used to build the calculation formula.
If any Properties assigned a variable change in your process, the formula icon next to the Property will turn red indicating an error in formula, which should be checked for accuracy.