In this step we add another YesNo question to the split. We do this by dragging a "YesNo question" from the tasks tab in the left hand list bar. Drop it on the split. It will be automatically connected to the split, and start a new thread.

You can see the second thread is seperate from the first by looking at the yellow boxes around the two question activities.
Configure this question to ask Bob (who for the purposes of this example will represent HR). This is done in the same way as in the workflow authoring how to.