Currently I have add-on items paid for during the campaign in my cart from waves 1, 2, and 3. My pledge level ships in wave 5. How do I remove everything (including my pledge level) from my cart except the wave 1 add-on items so I don't have to pay shipping and tax on everything all at once? I don't see anyway to control what's in your cart. There's a page for "Please confirm your previously purchased add-ons" but the only thing I can do there is click Next.

Confirm