In addition to using an expression for the value of an Expr. / Const. element, an expression can be used for the Initial Value of a User Entered element. When the IndustraForm is first created, or a new repeating section instance is added, any elements with an Initial Value expression will be set to the calculated value. After that the expression will not be re-evaluated, and the user will be able to change the value as with other user entered elements.
Sections that are not visible or enabled will still have their Initial Values calculated.