To set the value of a variable using a value in another variable, use Set Variable. For instance, a procedure that is running a calculation, when completed, will need to place the total into another variable. Set Variable can place the total. For a detailed example, consult the following post: Math Calculations with Arrays
To implement Set Variable, right click the form and select Add Pre-condition Procedure > Set Variable. The Procedure Properties dialog box will display. Select the variable which contains the value to add to another variable using the Use variable drop-down menu. Select OK.
The Set Variable Action dialog box will display. From the Variable drop-down menu, select the variable which will be set.