I requested a quote on a set of parts. Got it, it was too expensive in terms of shipping, but it turns out I had only 18g of parts, when shipping would cover up to 100g. Is there a way to move parts back to my cart, so I could add additional 82g of bricks without clicking it all again? I understand some parts might not longer be available or change price. I don't really care, I just want to avoid looking them up again.