I work for 14 days at my work location and remain at home for 14 days and there is a transit period of 2 days at Mumbai City far away from my hometown for job purpose. My work location is 80km away from Mumbai where I stay for 2 days before going to my work location. Should I offer Qasar namaz in Mumbai?

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Doesn’t matter it’s your part of job but your main Destination is the place where you work for 14 days not Mumbai.
According to Ayatullah Sistani

Who is a Kasir al-Safar (frequent traveler)?
Answer: One who travels for ten days in a month and sixty days in six months, he is considered a frequent traveler. Therefore, he should offer complete prayers and observe fast.

This will be applied for your work place not for Mumbai.