The purchasing” staff buys only tho

The purchasing” staff buys only those items needed by line menu planners.
Human relations personnel do not “hire and fire employees”; their role is to provide personnel needed by line departments and to provide technical advice about labor laws, training, and related specialized activities.
Accounting personnel are responsible for developing accounting systems, collecting financial information, recording data in financial statements, and making recommendations to (but not decisions for) decision makers in line departments.