1- go to wpc-catalogue.php
2- put this code after 81th line
//sub category class
if($term->parent > 0){
$class2 = ' sub-cat';
}else{
$class2 = ' main-cat';
}
3- change $return_string value this one (88th line)
$return_string .= '<li class="wpc-category '. $class .''. $class2 .'"><a href="'.get_term_link($term->slug, 'wpccategories').'">'. $term->name .'</a></li>';
4- go to includes/css. edit catalogue-styles.css
and place the following code in any line.
#wpc-col-1 ul li.main-cat a {
font-weight:bold;
}
#wpc-col-1 ul li.sub-cat a {
margin-left:10px;
}