There are two different ways to speed up your invoicing when you have recurring products or services.

You can for one, use an already sent invoice as a template (on the invoice view, click on the relevant link on top) and then change details.

Or you can use the recall function on invoice line level to speed up the process. Whenever you type in something you will get a previously entered value proposed (only for values from already sent invoices). Selecting one of those proposed values will fill out the whole line.