It might happen that you have to add one or several line(s) in an invoice or a quote, that is/are not necessarily linked to a job. For example, the time you spent on extracting the text from a PDF file or arranging the layout after the translation, the price of a courier to bring your sworn translation to your client, etc.
To add lines, you have to click on Add > Add a new line when you're in the invoice/quote screen.
You fill in the fields and click on Add.
Your new line will then appear in the invoice. You can move it up or down using the arrows on the left.