How to copy VBA

I work at a tax consultant firm and we use a paid Excel tool internally. I’m building a website to simplify some workflows for our office and potentially help others too. I’m not from a technical background

The issue is that the VBA/project is locked and not viewable. I tried using multiple LLMs to either analyze the workbook behavior or help me recreate a similar feature from scratch, but the outputs haven’t been accurate enough yet.

If anyone has experience recreating Excel/VBA workflows, I’d appreciate some guidance.