My favorite professional GPT that I made is a custom Copilot that I made to help me at work. There is a database of chemical incidents that occurred in our business over the years. I created a chatbot that can quickly search and summarize documents included in the file share. Instead of having to search for a particular incident, you can ask the chatbot to find one that has these attributes and it will quickly find it, give you a summary, and then provide a link to the file for further reading.