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Perhaps this method would be helpful. Consider a project called Evaluations ...

* Evaluations (project)
- New OS System (action group, sequential)
--- test new OS system (start date: when new OS is available)
--- buy new OS system
--- re-start other OS system dependent tasks
[note field: links to other tasks that should be restarted]

Each task that is in the note field has a start date that is either when the new OS is available or some time in the infinite future, so as to only be re-actived when it is available.