Noindex Products under a Product Category

add_filter( 'aioseo_robots_meta', 'aioseo_filter_robots_meta' );

function aioseo_filter_robots_meta( $attributes ) {

	if ( has_term( 'CategoryName', 'product_cat' ) ) {

		$attributes['noindex']  = 'noindex';

	}

	return $attributes;

}