TL;DR: You need to make your question an on-topic, practical, detailed question.
Super User is not a place for any kind of "question".
There are thousands of ways to use a template to generate multiple files from it, but it depend on several factors.
Your question doesn't include enough details for most of the factors. You practically are delegating to others several of the decisions and due to the lack of details there is a great chances that it will be required a lot of back a forth which this site is not intented to have.
If you don't have idea about how to use a template to create 100+ files, you should read a book, take a course, spend time doing tutorials, searching for related questions before asking a question, well, in this case, before editing again your question. Nowadays the Web have a lot of free resources related to what you are looking to do, even to learn to use Google and other search engines, an more recently ChatGPT became a hype, but be careful, trying to use a tool like ChatGPT without having idea about you will be chating with a tool that give looking feasible but wrong reponses besides making you lost time might make become confused and confuse others. Better look for reputable information and education sources.
Once you have a clear idea of how to do what you want to do, if you get stuck, review https://superuser.com/help/on-topic.
If your question is on topic, read carefully https://superuser.com/help/how-to-ask. Then comeback and edit your question.