The Expand Tree Nodes and Collapse Tree Nodes commands in the Tree menu allow you to simplify the display of larger, more complicated trees. By selecting an outlet point and collapsing the tree, everything "upstream" from the selected outlet will not be displayed until the same outlet point is selected and the Expand Tree Nodes command chosen. A collapsed tree node will be represented by connecting it to the rest of the tree with a dashed line. Even though upstream outlets and basins are not displayed, they are still a part of the analysis and would be written to the particular hydrologic model file.
The same result can be achieved using the tree display in the Project Explorer by unselecting an outlet icon. When you unselect an outlet icon everything from that icon upstream will not be displayed in the graphics window until it is turned back on.
Related Topics:
Topologic Trees