Activity Tree Dialog Box
The Select Activity dialog box allows you to change the target activity without having to exit the tool, select a new activity, and re-run the tool.
Expand or collapse an item from the hierarchical tree and then select a target activity. Click OK when you are done.
When you select an activity from a view and run Schedule Driver Analysis, the selected activity displays automatically in the Target Activity field on the Inputs tab of the Trace Critical Path Facility dialog box.