What is the horizontal professional group of hotel service and management?

As far as work is concerned, almost all hotel work starts from the grassroots level and becomes a supervisor, department manager and director a little bit. Even the management trainees of the group have to work at the grassroots level for a certain number of years and pass various grassroots assessments. There are many jobs in the hotel, such as restaurant, guest room, front desk, sales, accounting and so on. . .