Business rule default a DFF from position to assignment (redwood)

Summary:

Hello,

We are trying to understand if it is possible to default a Descriptive Flexfield (DFF) on the position to a standard field of the assignment when assigning the position to an employee. For example, on the position page, we have the DFF "position as a manager" filled in with the value "Y". When assigning that position to an employee, we want the "position as a manager" value to automatically populate the field "Work as a manager" with the same value specified in the position detail page (in the field "position as a manager").

Do you think this is possible with a business rule in VBS?