The SubClassType property of an object of ClassType clsColumn returns an enumeration constant identifying the specific subclass type.
Read-only
Objects of ClassType clsColumn can have a SubClassType property value of sbclsRegular or sbclsNested. A column has a SubClassType value of sbclsRegular if it is an individual column. If a column contains a nested table, it has a SubClassType value of sbclsNested.