Bootstrap custom template coding

[haredo]

Zen Cart 2.2
PHP Version 8.4

Using a bootstrap slideshow template for my website.
How can one code the line below with a constant so I don't always have to edit over 40 pages to change my new YOUR_TEMPLATE name on each upgrade?

<link href="../includes/templates/YOUR_TEMPLATE/css/step_by_step_guides.css" rel="stylesheet">

[haredo]

I used an EZpage with the following code

<a title="How to make a Bun" href="/steps/bun.html" target="_blank" rel="noopener noreferrer">Bun</a>

Then created a folder called steps with bun.html inside the folder at my root

bun.html is a DOCTYPE

Trying to use a constant for my YOUR_TEMPLATE name below, so I don't have to edit over 40 files each time on an upgrade and change the name for my override.

<link href="../includes/templates/YOUR_TEMPLATE/css/step_by_step_guides.css" rel="stylesheet">