The core section for building your invoice. Add and manage individual line items with the following fields: Description - What is being invoiced (product/service name) Quantity - Number of units Unit Price - Price per unit Tax Rate (Optional) - Apply specific tax rate to this line item Features: Add/remove line items dynamically Real-time total calculation (updated as you type) Automatic line subtotal display Support for decimal quantities and prices Store and manage the customer information that appears on the invoice: Field Description Required Client Name Full name of the client/customer Yes Client Email Email address for sending invoice Yes Street Address Physical address line 1 No City City/municipality No State/Province State, province, or region No Zip/Postal Code Postal code or