Part-time schedules are still preset schedules. They do not allow you the same flexibility to work for the next 30 minutes, take a few hours off, then work ano

Part-time schedules are still preset schedules. They do not allow you the same flexibility to work for the next 30 minutes, take a few hours off, then work another hour this evening without doing anything more than just starting or stopping the app whenever you feel like. How would you replicate that with part-time hours?