I used that online order form once, playmofire, but only for a few items. I don't know if you can expand it to more than 20 parts. I always email a list and the service is very good. It's worth including items even if they are shown as 'no longer available' on Find Parts, because the staff do have lists of some alternatives for discontinued parts. And try putting in Klicky part numbers too if you need any; most recent klickies seem to be available (though very few show up with Find Parts).
The spare parts service varies from country to country. The UK one seems pretty good, but I believe staff still have to enter every part number manually into their system, even if you send them an electronic list such as a spreadsheet! So if you send a long list, you may have a slightly longer wait to get a reply. Bless them all!