The Ref Id is a special type of project property you can use to map projects with a different database. Projects can have a Name they're known for by everyone in your team and a different Ref ID that matches the same entry on a different system, such as your billing software, or another document, such as an SOW or a PO.

When exporting your data, you can include this as one of its custom fields.

See how to export your data for more details.

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