Hello Amit,
Have you configured the EDI content manager and imported all the .b2b files related to your EDI format?
If yes, then the import might not be successful. I had faced this problem due to connection issues. Please try importing again and this may help you.
If you have not gone through the below blog, request you to refer this for installation/configuration of B2B add-on.
How to install the new B2B add-on
Regards,
Nitin