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Quick answer

Departments group your team, give each a manager who becomes the default approver, and let you cap how many people can be off at once. Set them up under Settings, Departments.
Find it under Settings › Departments

Open Departments

Go to to see your existing departments.

The Departments settings listing the existing departments — Your departments, with a New department button.

Add a department

Choose New department. Set a Name, pick a Manager (default approver for this department), and set Max people off at once if you want a cover limit. Pick a colour and click Save.

The New department form showing Name, Manager and Max people off at once — Name it, choose a manager and a capacity limit.

The manager is the default approver

Requests from people in a department go to its manager, unless a person has their own approver set on their record. See Set who approves leave.

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Capacity control

Max people off at once warns when a booking would take a department below cover, so clashes are caught before approval. Admins can override when needed.

Create departments and assign a manager