2. An expense reimbursement form is a voucher that reflects the reasons for reimbursement (such as "reimbursement items", "summary" and "remarks" as you said) and the approval process (such as the signature of department heads and unit heads) and authorizes the cashier to pay.

3. For example:

Wang, the general manager of the company, arranged for you to buy two signature pens and a pack of printing paper, which needs to be reimbursed. Well,

Fill in the "office expenses" of the project;

Write "two signature pens and a pack of printing paper";

Remarks are "designated by General Manager Wang".