How to separate Administer Salary and Manage Salary approval workflows?

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Could you advice please how can we separate workflows for salary changes when HR Specialist initiates the salary update and when Line Manager initiates salary update?

In particular, we are interested in the case when an HR specialist is also a line manager. How to configure the system so that when he increases the salary of his direct reports (employees), the approval chain is built as for the manager. And if the same person reviews the salaries for other employees (not from his team, but from his area of responsibility), the chain of approval was built as for the HR specialist?