Hi
Just want to know that whether we need Net Access
For adaption or programming or certain features can be done offline.
Also in diesel E90 -- where we have Bmw battery 90A but in India
We usually get 100 amperes
When we install these 100 A batteries where and which feature is to
be used to Register the battery andvwhat all steps are needed
Also if in F series does something like this exsits ?

Online functions are mainly the Flashing and EGS ISN, some DME ISNs require flashing (MSD81,MSD85,..) so these functions are online.
All other functions like: diagnose, coding , most of DME and DDE ISNs, Key programming, manual coding, FA manager, CAS replacement,.. etc are offline. If your device expired, some ISNs you cannot get due to the need to gather some information online too.
In regards to battery, no standard 100A battery in BMW list. you cannot chose/adapt this option(70,80,90,.. but no 100). Anyway, changing battery capacity can be done in FA manager in E and F series.
After you select the correct battery capacity, you must encode the CAS. The CAS then will inform the alternator about how much AMP must supply the battery.

But is it possible to register battery replacement yet? Or calibrate fuel injectors on N54?

Any function you cannot find in Autohex II, please use ISTA-D.
Autohex II supports using ISTA-D.