Running a formula from an event
After you add General formulas using the Settings tab, you can use the formulas when running events. For example, you can set a formula to run when a user clicks a button.
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General formulas by default run whenever a form item is changed by the user. You can set formulas to run upon a specific event. For example, if a customer is entering information into an order form, you can set a formula to calculate sales tax and a subtotal when the user clicks a button. To run a formula when a user clicks a button: