You can adjust the nesting level of slides to organize multilevel navigation in your presentation with the blue arrow buttons to the right of slide thumbnails:
Available levels will increase each time you move a slide to a subsequent level. For example, when all slides of your presentation are assigned to the top level (1), you can add only one nested level (2). Once you move any slide to Level 2, you will be able to move the following slides to Level 2 or 3 and so on.
Nesting depth of your presentation may reach eight levels. You can collapse and expand nested slides using "-" and "+" icons to the left of a top level slide.

You can mark any slide as hidden by double clicking its thumbnail. Hidden slides are not shown in navigation and thumbnails, and they are skipped during presentation playback. Please note that hidden slides still exist in you Flash presentation and can be accessed using hyperlinks or action buttons on the other slides.

Titles of slides are shown in the Outline tab of Advanced, Crystal and Classic Players. By default, titles are taken from PowerPoint slide titles of the presentation. To change a slide title, double-click it and type a new one. The new titles will be displayed in your Flash presentation navigation, and they can differ from PowerPoint slide titles.

To assign a Presenter to the selected slide, double-click Presenter's photo/name and select a different one from a drop-down list of available Presenters. By default a Presenter marked as Default is added to all slides in you presentation. To change a default Presenter, click the Presenters icon on the iSpring toolbar.

You can set up a slide to advance to the next one automatically after a specified period of time, or require a user to click to advance. To change the slide advance type, click the mouse icon (manual mode) or timer (automatic mode) icon.

You can set timing for automatic slide advance in the text field to the right of the slide advance type. It's also possible to specify duration for a selected group of slides in the corresponding text field on the toolbar.
Note: Slide advance time also depends on "Minimal slide duration" that can be specified on the Settings tab of the Publish window.

iSpring Presentation Explorer lets you import an audio narration to the selected slide.

To add an audio:

1. Click the Import audio narration icon to launch the Windows Explorer.
2. Choose the audio you would like to insert. iSpring Pro supports .MP3, .WMA and .WAV audio file formats.

   Selected audio track starts playback automatically. To disable this option, clear the Auto Play checkbox at the bottom of the explorer window.

   By default the slide duration is adjusted to the audio file duration. If you clear the Adjust slide duration to fit audio checkbox, PowerPoint timings for animated slides and minimal slide duration for non-animated slides may affect slide duration and your audio may not play to the end.

3. Click Open. The audio file will be added to the selected slide.