How to: Branch to another presentation during slide show.
Solution:
Run the slide show, and click the slide miniature of the presentation to which to branch.
1) Run the slide show:
a) Select the 'View' menu and select 'Slide Show...'. (The Slide Show dialog box appears.)
b) Click 'Show'. (The slide show begins.)
2) When the slide containing the branch appears, click the slide miniature. (PowerPoint branches to the other presentation.)
3) To return to the original presentation before the branch, continue to press the 'Next Slide' key at the end of the branch presentation.
NOTE: After showing the branch presentation, the next slide is the slide branched from.