Create custom invoice number formats with flexible prefix, separators, year inclusion, and sequential numbering. This feature operates independently from the individual invoice title/slug. Access via Invoices > Settings > Invoice Numbering tab. Setting Description Default Value Examples Prefix The text that begins every invoice number. Alphanumeric characters only. INV INV, INVOICE, INV-CL Separators Separator characters inserted at specific positions. Configure multiple separators with different positions. Dash (-) at position 3 Dash, Slash, Dot, Space, None Number Padding Number of digits for the sequential sequence, left-padded with zeros. 6 4 = 0001, 6 = 000001 Starting Number The first sequential number to use (begins at 1 and increments). 1 1, 100, 1000 Include Year Optionally