Precedence diagram method

Hi there,
i have a question concerning project management. Is there a functionality or tool integration, which provides precedence diagrams?
A use case would be giving a manager the ability to determine roadblocks in interdependent issues, for example caused by someone being on vacation.
The manager could then determine, whose issues are currently blocked and let them work on something else.
If not, i would be happy to get any suggestions how to achieve this.