Do you mean you want to process multiple files with a single LLM call or process multiple files using the same prompt across multiple LLM calls?

(I would recommend the latter)

Multiple files with a single LLM call.

I have a prompt which works for a single file in Copilot, but it's slower than opening the file and looking at it to find one specific piece of information and re-saving it manually and then running a .bat file to rename with more of the information, then filling out the last two bits when entering things.