You can't use multiple Visa Gift Cards or credit cards on Amazon to split up payments but you can use an Amazon Gift Card and a Credit or debit card to split up payments for a purchase.
You can turn your Visa Gift card into an Amazon Gift card to use up your Visa Gift Card Balance.
Go to Amazons website and look for the purchase Gift card section and then use your Visa Gift card balance to buy an Amazon gift card which you can receive through email and then make the purchase that way.