child theme with php files in subdirectories

I have several successful sites with child themes, but when a theme has a php file in a subdirectory that I’ve modified, placing my modification in child them directory, including new subdirectory, doesn’t work. The theme always opens the original. I set up child themes as defined at https://codex.wordpress.org/Child_Themes, including a functions.php file, but no luck.

Here is an example of one of my functions.php files:

<?php
/* 
 * Child theme functions file
 * 
 */
function himalayas_child_enqueue_styles() {

	$parent_style = 'himalayas-style'; //parent theme style handle 'himalayas-style'

	//Enqueue parent and chid theme style.css
	wp_enqueue_style( $parent_style, get_template_directory_uri() . '/style.css' ); 
	wp_enqueue_style( 'himalayas_child_style',
	    get_stylesheet_directory_uri() . '/style.css',
	    array( $parent_style ),
	    wp_get_theme()->get('Version')
	);
}
add_action( 'wp_enqueue_scripts', 'himalayas_child_enqueue_styles' );
/* get_stylesheet_directory() . '/inc/widgets/widgets.php'; */
?>

I think I need to add something like
get_stylesheet_directory_uri() . '/inc/widgets/widgets.php',
somewhere, but I don’t know where. Everything you see here I copied from others, as I do not know PHP. Any help will be appreciated. Thanks.