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You can specify an expense policy, which appears on the top of the submit expense form, to give guidance to expense submitters. Making it clear what expenses will be approved and what submitters need to do will save time for you and them.
To update your expense policy, go to your Project's page, click on the gear icon next to your Project's logo and go to the Expenses Policy page.
If you have not specified an expense policy, when you view the submit expense page for your Project, you will see a button asking you to add one.
Often times, Project expense policies are focused on what categories of things are allowed as expenses, while the Fiscal Host policy pertains to required documentation, like details on invoices.