Create properties for a method of a COM class

I have an object data area with more than 145 data definitions (fields). It seems that when I try to add a new property the interface builder does not give me a list of fields defined in the object data area of the class. For a small object data area it does provide a list of fields defined in the object data area. Is there another way so that I don’t have to manually define all the property names and data format ?