Order Custom Posts by Several Fields

by

You can do it with WP_Query:- 

$query = new WP_Query( array ( 'post_type' => 'product', 'orderby' => 'meta_value', 'meta_key' => 'price' ) );

Replace ‘price’ with your meta key.

Reference:-

http://codex.wordpress.org/Class_Reference/WP_Query#Order_.26_Orderby_Parameters