If you are using power store 4, you dont need to create any custom shipping rules.
When editing a product, go to the Additional settings tab. you can specify an item shipping rate here.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.