To delete a lower-level decision tree, follow the steps below:

1. Open the Decision Trees window.
2. In the table in the Decision Trees pane of the Selection tab, right-click the lower-level decision tree to be deleted and select Delete. The application checks whether the decision tree is assigned. If it is not assigned, the tree is deleted.

   If the decision tree is assigned, it cannot be deleted. A warning message will appear notifying you that the decision tree is used in analysis.

3. Click the  icon to save the new information.