Use the Set Field command to add the values of numeric fields together and then populate a form field with the calculated value.
2.On the Properties bar, choose the event that should trigger the Set Field behavior to run. PerfectForms™ switches to the Behavior view.
4.On the Properties bar under the Field section, click Select. Choose the field where the result of the calculation should be written.
5.In the Value section of the Properties bar, select the data that should populate the field.
6.To populate the field with a calculated value, choose Formula and click Compose. PerfectForms™ displays the Formula Editor.
7.Select the <empty> line and then select Value of a Field on the right.
8.Click Select and locate the first field to act as part of the calculation.
9.Click Add Line.
10. Click on the added <empty> line and then select Value of a Field on the right.
11. To change the operator from the default plus (+) sign, click the + and choose a different operator from the list.
12. Click OK. You have now built a formula that evaluates the values of two fields and places the resulting calculation in a form field.