You would want to put that in task #7 since task #6 is a "parent" task.
But yes, make task #2 As Late As Possible. That should give you the end
date of task #2 3 weeks before task 7 (and by default task 6) begins.
One more question, is task 7 a hard start date? If so, that task
constraint should be Must Start On. Let me know if that works for you.
If not, we can talk through it further. Shelly Long, PMP, CSSGB
Marketing Traffic Manager Pier 1 Imports Accelerate to Excellence