Improve useability of editing lines in web client

Currently it is very tiresome to add new lines and to edit lines in an object using the web client, due to the number of click required.
It would be much more user friendly to use grid of fields to allow the user to edit all lines in one time.
Web interfaces of many other systems allow to do this.
I attach a screenshot of Coupa, a popular web-based e-procurement system, as an example. (the screenshot is shows how to edit invoices in Coupa)
(click "read full specification" to view screenshot)