Unfortunately, without creating custom permalinks, there is no option to make the categorise change dynamically.
To do that, check out http://codex.wordpress.org/Using_Permalinks or try to use the plugin like the following: https://wordpress.org/plugins/custom-permalinks/
You can change the static part “portfolio-item” in URL by modifying post-types.php which is located in wp-content/plugins/elvyre-core/includes/. Find the line:
'rewrite' => array('slug' => 'portfolio-item', 'with_front' => true),
and change “portfolio-item” to anything you want.