A task performer that responsibly for a department

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Hello,

My client need is-

There is a clerk that responsible to a department or certain departments.

The need is that clerk will be responsible for a task.

I can't use line manager because the clerk doesn't have a role of a line manager.

I try to use area of responsibly but I couldn't find a solution for that

The need is that the clerk that responsible for that department will be the performer of the task depending on the employee department

Is there a solution for my client's need ?

Thank you

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