@Triston Merritt It would be an invoice that is not tied to a specific order or product.
Some useful info here:
Credit memos can be created manually under the $ icon.Finance charge, bounced payment, & CC fee invoices are automatically generated based on a customer’s financial settings..So basically, there’s no way to just create an invoice without it being attached to an order/products.What you can do is you can create a product that doesn’t have any real info to it (like maybe just 1 comments attribute so they can type in what the invoice is for) and then set a fixed price $1000 In the pricing section of the product, then manually override that with whatever you’re actually quoting the customer.