It is a common requirement in many businesses that some employees' are allowed to do expenses on behalf of the company such as purchase books, CDs, software subscription services, or expenses for travel and accommodation during business trips.
There are two ways expenses can be registered, either by creating an expense line in the expense sheet or by sending an e-mail to the e-mail address that will create an expense line automatically. The expenses can be paid by the employee initially, and it can be reimbursed later by the company, or some employees' can have a company card to pay for expenses. They would just need to submit the valid bills for the expenses.
Usually, an expense that was incurred by an employee has to be verified by the related manager, and later, the accountant processes the reimbursement. Sometimes, the manager may disagree on some expenses too, which will be rejected, and the employee may not get the reimbursement or may get a partial payment...