This feature allows you to create an open variable using the functions of AskiaScript. You can use it to recode a variable with responses into an open variable.
To access this feature, in the edit menu select create a variable... and select open by script. Drag individual questions from the questionnaire tab in the left-hand pane into the script window, and make use of the functions in the contextual (right-click) menu. Enter the name of the new variable in the caption box.