How do I make my predecessor start X days before/after another task ends?

To add a delay or overlap to an existing predecessor, append a + or - sign and the number of additional days to the existing predecessor relationship. For example, let's say you want to add a 2-day delay to task 2, whose start is dependent on the completion of task 1. You would update the existing predecessor format of 1fs to be 1fs + 2, which would account for the extra 2-day delay. 

More information on schedule predecessors can be found here.

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