To modify a lower-level decision tree, use the following procedures:

• To change the name of a decision tree in the table of the Selection tab, highlight the existing name and then type the new name.
• To change the treatment assigned to a termination node, right-click the node and select the appropriate command for which treatment you wish to change.
• To change the values that determine which branch is followed, display the View/Edit tab. Then right-click the parent node and click Edit Decision Var Limits. In the dialog box that displays, re-configure the right pane with new values to determine what branches are followed depending on the value of the decision variable.
• To change the decision variable that determines which branch is followed, you can only use a decision variable that has not been used at a different level of the decision tree. This may mean that you will have to alter the decision variables for more than one node. To change the decision variable, use the Edit Decision Var Limits command to select the decision variable and the values that determine what branch is followed.
• If you want to remove a node from the decision tree, only child nodes can be deleted. Furthermore, if a parent only has two child node and you delete one of them, the system will automatically delete the other as well. To delete a node, right-click the child node and select Delete.