How to use a handlebars layout to render many different pages

Basically, I want to have a layout that handles everything except the body of my page.

Then, I want to have 4-5 partials that then are rendered in the body of that layout.

I am unsure how to do this. I also need to be able to pass the layout parameters, and the page parameters. Is this possible?

Thank you.

via Sammy Roberts