3.5 Explosions and Decompositions Tool
These tools work identically: the list on the left shows which
types can have a subgraph, and the list on the right shows the possible subgraph
types for the type selected on the left. The lists have identical
menus.

Add...
allows you to add a new source type or subgraph target type.
Delete removes the subgraph link(s) for the
selected type.
Edit Type opens the appropriate type Definition
Tool for the selected type.