On the last page of the Debugger Wizard, you can select the following target options:
Discard target data.
You can choose to load or discard target data when you run the Debugger. If you discard target data, the Integration Service does not connect to the target.
Display target data.
You can select the target instances you want to display in the Target window while you run a debug session.
When you click Finish, if the mapping includes mapplets, the Debugger displays the mapplet instance dialog box. Select the mapplets from this dialog box that you want to debug. To clear a selected mapplet, press the Ctrl key and select the mapplet.
When you select a mapplet to debug, the Designer expands it to display the individual transformations when the Debugger runs.
When you do not select a mapplet to debug, the Designer does not expand it in the workspace. You cannot complete the following tasks for transformations in the mapplet:
Monitor or modify transformation data.
Step to a transformation instance.