can i get hongkong tourist visa from mumbai? instead of getting it from there

You can apply from the HK Immigration Department directly or Chinese embassy in Mumbai. If your application accepted by the embassy needs to be done by HK authorities, you need to wait around four weeks to receive it.

If Chinese embassy takes care of your application, you will get it in four working days.
Receipt and Despatch Unit
Hong Kong Immigration Department
2/F, Immigration Tower
7 Gloucester Road
Wan Chai, Hong Kong