Itinerary for German Schengen visa

I am planning to visit Germany [multiple cities], Paris and Zurich as part of my upcoming trip for almost 10 days with 6 days in Germany, 2 days in Paris and 2 in Zurich. I will be first going to London for business trip and then will start my personal trip to Germany and other cities.
As part of my visa application, I need to submit itinerary and I am wondering what all should I include in my itinerary.
I plan to include my Delhi to London air travel and then my air travel to Frankfurt. Then my return train travel from Zurich and Paris. And then my return flight which is from Frankfurt to Delhi.
Should I include my travel within Germany to different cities in itinerary.
Do I also need to submit my hotel stays in all cities during my travel?
Another thought I have is just show itinerary from Delhi-Frankfurt-Delhi, showing all days in Germany along with hotel stay to get the visa, and then later plan my trip. Any idea if this will work or can hamper my Visa or trip?
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Is travel itinerary required for Schengen Visa?
One of the required documents for the Schengen Visa is a complete travel itinerary.How long does it take to get a Schengen Visa for Germany?
Visa Processing Time The processing of short-stay visas to Germany takes around ten days to be processed. However, when the embassy is processing many visa applications, tourism visas may take a bit longer since business visas or others are treated with more priority.How can I get my visa itinerary?
Flight itinerary for visa applicationCan I change my itinerary after getting Schengen Visa?
"can i change my itinerary within the schengen area ?" You should follow the itinerary you gave when you applied for the visa. You cannot change your itinerary so completely that the information you gave in the visa application is no longer true.Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: Ingo Joseph, Serkan Göktay, Nataliya Vaitkevich, Skylar Kang