How to handle Down Payments

I am having trouble trying to determine how to do down payments. I wasn't certain the best way to handle it. I had to create a line item for 50% down payment. Then in the closing box listed the items the project included.

I prefer to create a list item for each item as well the related costs. Then have the option to send an invoice for 50% as down payment.

Is there a way to do this? Or will i have to create 2 different invoices?