Invoice and Inventory Spreadsheet Integration

I need a comprehensive spreadsheet that combines data from my invoices and inventory, along with a final total figure.

Requirements:
- Combine item descriptions and quantities, prices and amounts, dates and invoice numbers from invoices.
- Integrate item descriptions and quantities, prices and amounts, and stock levels from inventory.
- Calculate a final total as the combined total of all prices and stock values.

Ideal skills and experience:
- Proficiency in spreadsheet software (Excel, Google Sheets).
- Experience with data integration and financial calculations.
- Attention to detail and accuracy in handling financial data.