I have a full-time resource that will work on two tasks: task 1 for January to March, and task 2 only in February. The allocated time (unit) for task 2 will be 50% as it overlaps with task 1. The unit of task 1 has to be 100% in January, 50% in February and 100% in March. Setting the unit for task 2 is easy, but how could I set different units to the same task over time?