Ok sounds good. You could simply record the starting points of revenue and net income before you make one change e.g. expectations for Audi performance and then see how much revenue and net income changed after you made this one single change and note down the difference. If you do that before and after each change you can highlight to the readers which of the changes to the valuation model that you made are the most significant by showing the impacts in terms of numbers for all changes.
Example:
My improved confidence in the ability for Audi to deliver better performance in H2 following its stabilized earnings in Q2. (Revenue +500 million, Income +200 million)