Developed and delivered the core Sales Creation and Registration feature for the seolhee-choi/B2B-Demo repository, focusing on streamlining order workflows and improving data-entry efficiency. Built a dedicated page using Vue.js and JavaScript, incorporating a form for customer and product details, pricing, delivery, and shipping address, with integrated product search by code and automated final sale amount calculation after discounts. Enhanced user experience by adding customer and product search modals to minimize manual entry errors. Established reusable UI patterns for forms and modals, laying the groundwork for scalable enhancements such as tax and multi-currency support in future development cycles.