I need an Excel file to efficiently manage stock, create invoices, and record purchase and sale entries. Key Features: - Stock Management: - Real-time stock levels - Low stock alerts - Automated restocking - Invoice Creation: - Customer information - Itemized list of products - Payment terms - Purchase Entry: - Supplier information - Product costs - Quantity purchased Ideal Skills and Experience: - Proficiency in Excel - Experience in developing stock management systems - Knowledge of invoicing and purchase entry processes Please provide a sample of previous work.