Invoicing Application

This lesson shows how an Excel-based invoicing tool can be delivered as a web application with the SpreadsheetWeb Legacy Platform. Users enter customer and line-item information through a controlled interface, while the workbook calculates prices, taxes, discounts, and totals. The application preserves the business logic of the spreadsheet without requiring users to download or edit the source file.

Use this approach when an organization wants a consistent invoice-entry process or needs calculated invoice data stored in a central location. Before conversion, organize the workbook inputs, formulas, lookup tables, and printable output so each part has a clear purpose. Determine how invoice numbers and customer details will be handled, which values should be saved, and who may view or revise a record. Test several realistic invoices, including boundary values and optional charges, and compare the application totals and generated output with the original workbook.