I have a task (row 100) which have two predecessors, row 20 and row 30. As it is now, row 100 starts 4 weeks after row 20 has finished and 4 weeks after row 30 has finished. Is it possible for MS Project to automatically schedule after which one of the two tasks that finishes last. So for example if row 30 is delayed with two weeks, I want row 100 to be rescheduled so it still starts 4 weeks after row 30 has finished (and now 6 weeks after row 20 has finished). How do I do this in MS Project?