Sales Quote Quantities not decreasing after creating partially filled Delivery Order

I created a sales quote and the customer needs to pay 30% upfront. When I turn the quote into a delivery order, I put .3 in the delivery column, so we only collect 30% of the total.

But when I go back to the Sales Quote, the balances in the amount column have not decreased. How do I ensure the amounts in the original order change after I partially fill it?