You can create as many different types within each class as you wish. Types Block types further define the characteristics of a block of a given class. Block types are important to recognize during creation of a scenario since global attributes specified in the database apply to all blocks of the same type. Attributes Characteristics of polygons and blocks are described using attributes, which can be quantifiable numbers, discrete values or pointers to other data items. All attributes can contain a reference to a data source, whether that source is a scientific journal article or a ballpark estimate.
Global attributes describe a characteristic that is common to all blocks of the same type.
Global attributes are specified in the Database window. Local attributes are specific to individual blocks. When you change a local attribute you are changing it only for the selected block. Local attributes are typically used to represent characteristics that vary from block to block, even though the blocks may be of a common type. An example of a local attribute is the flowpath length of Groundwater blocks.