Create a View on iExpense "Expenses Audit" Page That Includes Cost Center?

We would like to create a view on the iExpense "Expenses Audit" page that includes the Cost Center from the expense report header.  When creating a view, Cost Center is not one of the available columns.  Is it possible to add it?  Our AP clerks split up expense report auditing by cost center, and it would be very helpful if they could view expense reports pending payables approval by cost center.