Reply To: Applying a master based on paragraph style

Hi Rivkah: I just tried the script above and it works great. It needs some customization for your situation, of course. In this case, it is looking for a paragraph style called “CT” and when it finds it, it applies “B-Master” to that page. You can change “CT” and “B-Master” in the script to your specific paragraph style and master page name.

Here is an article that shows how to save the script and install it:
https://creativepro.com/how-to-install-a-script-in-indesign-that-you-found-in-a-forum-or-blog-post.php