Custom Excel Accounting Software for Law Firm

I'm in need of a custom-built Excel-based accounting software for my law firm, that mirrors the functionality of Tally.

Key Features:
1. Automated Invoice Generation: The software should have the ability to generate invoices automatically, saving time and ensuring accuracy.
2. Recurring Billing: The system should accommodate recurring billing for clients on retainer or those with ongoing services.

Ledger Maintenance:
- The ledger should keep track of payments and dues.
- It should maintain a comprehensive transaction history for each client.
- The software should also facilitate reconciliation with bank statements.

Billing Format:
- The bill format should be customizable to fit our firm’s letterhead.
- Each invoice should include a description of the service provided.
- The header of each invoice should contain our firm’s details.

Ideal Skills:
- Proficiency in Excel and its advanced functions.
- Previous experience in developing custom software within Excel.
- Knowledge of accounting principles and billing procedures.
- Ability to create a user-friendly interface within Excel.

I look forward to hearing from freelancers who can meet these requirements.