PHP Billing UI Enhancements

My current PHP-based billing and inventory system needs several small but very visible interface tweaks. 1) Extra row-grid table 2) Discount in specific report Discounts must appear in list that shows line items or invoice totals Users should be able to store and view discounts as a percentage or a fixed amount; whichever value is saved must render correctly and be included in grand-total calculations. 3) Show actual previous due On the customer ledger page I need the “Previous Due” column to display the real outstanding balance, not a placeholder or calculated value from elsewhere. 4) Replace alert quantity with cost price ITEM List Deliverables • Updated PHP, HTML and CSS files reflecting the above changes • Any new SQL needed for additional columns or calculations Acceptance All pages must load without errors, calculations must reconcile with existing totals, and the new columns must respect present search/sort/export functions.

Project ID: 40422102