Bookend a scheduler task with two predecessors & variable number of days

My smartsheet scheduler task will float between two predecessors… meaning it will start at the same time as one task (i.e. 10SS) and finish in coordination with another predecessor (i.e. 12FF). The number of days will technically be variable and change as the predecessors change. Smartsheet does not seem to allow this, but am I missing something?
Answers
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@ctalley5, does your scenario allow you to use a hierarchy such that your 10 and 12 rows are children to your scheduler task? I suggest this because the parent will "naturally" use the 10SS and 12FF "structure" if you can. Let me know if my suggestion is missing something!
Best,
Will
Will Jeffords
Workflow Wayfinder™
Biz Ops Leader | Smartsheet Overachiever | Community Hype-man
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That's a creative approach, @Will Jeffords. It would feel unnatural in most of my scenarios, but I will have to keep that in mind for instances where that could work.
Thanks