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

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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?

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