Creating an aggregate from a set of input classes

To create an aggregate from a set of input classes, use the Input Classes and Aggregate Classes tables in the Aggregate window.

From the Input Classes table in the Aggregate window, select a row containing the class you want to add.
If you want to select multiple rows, hold down the Ctrl or Shift key while selecting rows.
In the Aggregate Classes table, select the row containing the aggregate class that is to receive the input class.
Click Add.
Repeat steps 1 to 3 until the input classes are assigned to the appropriate aggregate classes.
Click Apply to Output Channel. Focus copies the input classes that were not used in the aggregation process to the aggregate classes.