How to change Blank style template project to Non-Fiction

I’m new to the software and started my book using a blank template. Having discovered the non-fiction template, I would like to change the template style to non-fiction. How can I bring in what I have written so far without losing the content.

Also, can I keep my chapters and research section from the original blank template?

Your help is appreciated.

This thread may be helpful, Converting Templates Mid Project.