No, you can only purchase a season-long parking space during the season ticket campaign. However, you can purchase a single parking space for each match either through the Juventus website or at Juventus Stadium on the day of the match.
Yes, as long as the pass is clearly displayed on the car's dashboard while it is in the parking lot.
Yes, your parking space is not tied to your car license plate in any way.
No, it is not possible to cancel your season-long parking space.