Pickup shots in practice
They are usually discovered in the edit. Pickups involve a reduced crew and are planned to match the original footage in lighting, wardrobe and props, which is why continuity notes and photos matter. Larger changes, where whole scenes are redone, are called reshoots.
Where it lives in CrewDesk
In CrewDesk pickups are scheduled like any shoot day: an event on the calendar, tasks for the people involved, and the same cast and gear records as the original shoot.