How to use user input task in-process model workflow to accept task by more than one manager (each manager have a manager for him)
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I believe you are looking to use the multiple node indexes (MNI) feature.
Go to the user input task properties > Other
1. Check 'Automatically run multiple instances of this node'
2. Check 'Run one instance for each assignee'
You may also want to handle the output data from all the instances of those tasks.