Data model change

Dear all..

This is about a data model change.

can we create a navigational attribute for an info object in BCS.

In other words for an Existing sub assignment we want to create a attribute which will have values. So that a report can be taken on those values.

For example we have a Sub assignment called "Business unit" for which we want to create a attribute called " Type ". And we have values for attribute "Type" like 1. Asia 2. Amet; User want to take a report on "BU - Type - Asia"

Thanks in advance.

Kamal