A Way to Import data in client invoices

I'm trying to import data from an excel file to client invoices, the problem is that the full ammount doesnt show due to the fact that an invoice line isn't created, so I need to create a new Invoice line manually in order to show.
Let's say I have 100+ new client invoices to import, is there a way for the invoice line come filled aswell? Or do I have to type it manually for each new client invoice