Is there a way to have a task begin X number of days before another task ends or begins?
To have a task begin X number of days before another task, you need a lead time. Lead time is overlap between tasks that have a dependency.
For example, if a task can start when its predecessor is half-finished, you can specify a finish-to-start dependency with a lead time for the successor task. You enter lead time as a negative value.
Let’s say you have two tasks. Task ID 1 with a duration of 5 days and Task ID 2 with a duration of 3 days. You want that task ID 2 starts with 2 days before task ID 1 ends. In the Predecessors field, we establish a Finish-To-Start dependency and set the lead time -2days: 1FS-2days