Excel Stock Management and Invoicing Tool

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.