Hi Kumar,
If your question is regarding BPC then IC Elim works only between Entity and InterCompany.
Because all the rules are configured based on Entity & interco.
Incase you want to handle Intercompany eliminations, you probably have to use Customer Dimension (of type Entity) and Vendor ( of type InterCo).. As I don't know what exactly is your business scenario so I can't provide the exact solution .
Thanks & Regards,
Bishwajit