Hi there @maxcharron,
It sounds to me like you're looking to send your customer an Invoice in the amount of half of their total, to act as a deposit. Since you haven't received the payment yet, I can see how adding the Deposit field to the Invoice isn't quite what you're looking for. I believe the steps that'll help you out most can be found in the article that was shared above by @LauraAB. Let me give you a hand.
The article goes over how to Record a retainer or deposit and highlights how you can set up set up a deposit that's treated as a liability. This shows that your business is holding the money and that it doesn't yet belong to you until it's been used to pay for services. It breaks down how to invoice customers for these deposits and how to turn the liability into income.
The article will have you set up a Liability account at first and then an item to act as your Deposit or Retainer. Step 4 gives you the options to record either a Sales Receipt or an Invoice for these Deposits. In your case, I believe entering an Invoice is the correct process. Step 5 breaks down how you can turn your deposits into credits so that when you've received payment towards them you can record it like a payment in the system. I won't go through all the steps here because it's all laid out very clearly and with thorough steps in the article that's linked above. Please give that a read through and test it out to see if it'll work for what your business needs.
I'm here if you have follow-up questions on this. Have a great day!
