Hi ,
You have to first understand whether you want to create scenario for:
1.Intercompany Matching (a separate model ,package and configuration - IC BOOKING) Model - ICMATCHING
or
2.Inter Company Elimination.If it is intercompany elimination then it will be CONSOLIDATION Model ,and separete consolidation script/package and you have to define the Inter Company Accounts and Business Rules for Eliminations in Consolidation Model.
Hope it helps!!