This function adds a category link to the standard Avia Post Grid and Post Slider elements.

// Add Categories to Avia Post Grid & Post Slider

'avf_postslider_show_catergories_mod', 10, 1);
function avf_postslider_show_catergories_mod($category) {
 	$category = 'show_business'; // or show_elegant
	return $category;
}

add_filter('avf_postslider_show_catergories',