Invoice Prefix & Postfix are use to Add text value Before & after Invoice Number Like GST/##/18-19 (Where ## is Invoice Number)

Step 1 : Click on the Profile icon on the top right bar then click on “Setting” menu.

Step 2 : Click on Document option

Step 3 : Click on “Sale Invoice” option

Step 4 : Now Enter the Prefix and Postfix details you want to mention, Invoice Prefix will show before your invoice Number ( Ex : GST/)
Invoice Postfix will show after your invoice Number ( Ex : /18-19) then click on “Save Button”