To assign a transition effect to a group of slides with the dialog box

1. Click the Transition button in the ribbon. The Transition Effects dialog box opens.

2. Choose the transition settings that you want.

3. Select the slides to which you want to assign the transition effect by holding CTRL and clicking the entries in the slide title list box.

4. Click Apply to assign your transition choice to the selected slides.

5. Click Close to close the dialog box.