The most important thing is to supervise whether employees abide by the management system, and deduct money once they find that they are not in compliance. -This is what the Commissioner for Administration should do, but the deduction is illegal and needs to be euphemistically expressed.
2. Receive mail, answer the phone, purchase all kinds of office supplies, and be responsible for staff accommodation. -This is what an administrative clerk needs to do, but generally speaking, if he is also a receptionist or document manager, it is also his second duty to answer the phone or receive emails.
3. Record employees' attendance and commuting time, evaluate overtime pay, complete document reports, arrange documents and issue documents. -These are basically the responsibilities of personnel clerks, and posting documents is generally the responsibility of document control clerks.
4. Sending notices, arranging company meetings, receiving visitors, etc.-these are the duties of ordinary clerks, usually done by the front desk.
According to the size of each enterprise, the division of responsibilities will not be so fine. What you said is what clerks need to do.