Hello Sunil,
This is Julie from SAP Product Support.
Before you install DS/IS 4.2 you must have a CMS/CMC in place. It is recommended you use IPS, not the BI Platform (what you call SAP BO) as BI Platform is patched at a different rate than IPS and often newer BI patches are not certified for use with DS/IS until much later.
Refer to KB article 1740516 for the latest information on supported versions (paste link below into your browser, you must have a valid s-user id to access this KBA):
https://support.wdf.sap.corp/sap/support/notes/1740516
Here is the location of all the DS 4.2 documentation (paste into your browser):
http://help.sap.com/bods?current=bois42&show_children=false
Pay special attention to the Master Guide, which will help you plan out your deployment, as well as the Installation Guide for UNIX
Here is the location of all the IS 4.2 documentation (paste into your browser):
http://help.sap.com/bois?current=bods42&show_children=false
Alsoreview the IS Installation Guide for UNIX.
Thank you,
Julie