Note: This process should happen when a client is transferring from one proposal to another and has already made a payment on the first proposal.
Step 1. Account Rep creates a new invoice.
Step 2. Account Rep edits the old invoice so that it is paid in full with the client's initial payment and makes one line item that says "Transfer to invoice #(New invoice number)".
Step 3. Account Rep adds all of the line items that the client's first payment would cover and adds a discount if necessary.
Step 4. Account Rep adds a check payment to the new invoice to mark it as paid in full.
Step 5. Account Rep leaves updates to the corresponding invoices in the One-time boards to make sure the transfer is followed.