In iExpense is it possible to restrict the use of certain expense types to certain individuals/depar

We are trying to determine if this can be done within the Standard iExpense functionality or if it could only be done through a customization.  Our AP department would like to be able to assign expense types to specific individualts/departments.  In essence, they want some expense types hidden from use during entry of an expense report for some users.  We are on 12.1.3 of the application.