I am currently working on a WordPress website, where the chosen shopping platform is WooCommerce.

I want to create a series of Template files, to be called within the `content-product-single.php` file, which contains Maths calculations. For some reason, the Maths calculations only seems to work when placed in the `functions.php` rather than my assigned Template files. It was suggested that the way in which I was using the `get_template_part` tags could be incorrect. Here is the original code I was using:

```
<?php
    if (is_product_category('category-name')) {
        get_template_part( 'templates/template-a' );
    }
    elseif (is_single('product-slug')) {
        get_template_part( 'templates/template-b' );  
    }
    elseif (is_single('product-slug')) {
        get_template_part( 'templates/template-c' );   
    }
?>

```

If anyone notices any errors in my above code, then please do let me know as that could be the issue but for the time being, I think that my Maths coding may only work within a `functions` file.

For organisation purposes, is there a way I can create multiple `functions.php` files or would this be bad practice? I have tried `functions-template-file-name.php` and placed this in the root of the theme but still the Maths does not work.