Settings
Document numbering
Series for invoices, quotes, proformas, and branch prefixes.
Auto-created series
Open Settings → Document numbering. Series rows for invoices, quotations, proformas, and related docs are created automatically (or on first issue). You are not stuck with an empty list forever.
Customise prefixes
Change prefix and next number, then Save. The next issued document uses that series (padded serial as configured).
Branches (optional)
Branches are only needed for multi-location prefixes. For a single location, skip branches and use the default series.