I want to import different meta object types with a single import sheet. They all inheriting from one parent meta class. Let's give me two examples: Imagine the meta classes (or meta objects as you will) student and docent. They both inherit from System.User. Or let's say we've a Car and the following classes inherits from it: Ford, Fiat, Hyundai, e.t.c. You don't want to create a import template for each meta class, but import it all from one sheet. Maybe with a additional column witch contains the name of the meta object of the sub type. There are many other cases where this should be very useful.