The Expenses feature allows you or your employees to create employee expenses. It can be toggled on from the Settings > Configure system > Toggle features > Features menu:
You have a choice of how you would like to record your employee expenses:
Employees can be added as a contact on either the Purchases > Expenses menu or as a supplier with employment status, from the Contact > Supplier menu.
To create and view their own expenses, employees can be invited in as new users from the Home > Users menu. This new user must be linked to the employee contact by selecting the appropriate name in the Employee (if applicable) field.