Hi Moumita,
There are NO pre-requisites for creating Profiler Repository in BODS. Just create it like creating any other repository in Repository manager with repository type as 'Profiler'.
Also you need to be careful while configuring this profiler repository in CMC. You MUST select the option YES in the field - 'Is Profiler Repository'.
After selecting 'YES', two more fields will appear :
1. Profiler Server Hostname - <same as BODS server IP>
2. Profiler Server Port - <8080>
Hope it helps!