What exactly do clerks (not buyers) in the purchasing department of five-star hotels do?

The purchasing clerk is to inspect, settle accounts and manage the overall price of goods when receiving goods.

For example, in the early morning, the supplier sends the ingredients and goods purchased by your hotel to your hotel. You should take the purchase orders of the departments in front of your hotel, go to the receiving office and inspect the goods with the suppliers to see if the quality, name and specifications of the goods meet the conditions you accept. When receiving goods, be sure to count the quantity, see the quality clearly, ensure personal safety and avoid losses.

After receiving the goods, take the list, notify all departments to pick it up, and count it when picking it up. Don't take too much, it won't match.

At the end of each month, sort out the total purchase amount and hand it over to the superior.

Generally speaking, these are the details you are asking, other colleagues. Or read a book.