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Click on the gear icon in the top bar to access ⚙ > General > Service units.
Service units are standard standard unitof measure (hour, word, page, etc.) for each service (Translation, Desktop Publishing, etc.) provided which can be linked to a service in the details tab of resource profiles.
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Do not forget:
Units and unit codes must be defined to create and import invoices from an XLSX template and for reporting purposes.
⚙ > General > Service Units - FlowFit User Documentation - Confluence (atlassian.net)