How to book purchase of new software of rs. 1 lac?

Intangible Fixed Asset

Yes ,Under  Revised Schedule VI ,Software is  to be shown under Intangible assets. 

The same should be booked as software and to be shown as Intangible Assets.

It is an expense the benefit of which will be derived to you over many years or until its license expires. So booking the whole expense in current financial year is incorrect, as its benefit extends to more than current year. Correct step is to treat it as Intangible Fixed Asset. At the end of year, you will charge depreciation @ 25 % under Income Tax Act, 1961. While booking under Intangible Fixed Assets, don't forget to add all charges or duties paid by you (in acquiring it) to its cost.