Custom Template

Hello,

I think this is a relatively simple question, but I couldn’t dig up any answers about it.

To call on the sidebar, we use the following code;

<?php get_sidebar(); ?>

I would like to create another sidebar type file that I can call upon in a similar fashion to the sidebar, so I don’t have to edit every single template.

So for example I might have a box on my site that I want to show on every page, but instead of editing every single template it’s on, I want to have something like this in the code;

<?php get_smallbox(); ?>

Which then links to a php file in my theme directory that works in the same way the sidebar does.

I assume this is easy to do?

Hopefully that makes sense!