I have an invoice to be sent to a customer which has 12 items on it, but I only want to invoice 1 of these items -how do I do this please?

Hello User83197, 

Welcome to the Community page, 

So there is no way of being able to send that 12 item invoice to the customer with it just showing the one item you need. You would either have to delete the other 11 items off so the invoice just shows that one item or this would be better to do is just create a new invoice for that one item you need to invoice for them and send them that.