You can use Slide Sorter view to see all the slides in your presentation and make changes to the order of the slides. Simply drag the slides around in Slide Sorter view to change their position in the slide show.
To move more than one slide at a time, press and hold the Ctrl key while clicking on the slides you want to move.
Hiding a Slide
You can hide a slide in Slide Sorter view so that it doesn't appear in the show itself, yet remains part of the presentation file. Click the slide, open the Slide Show menu, and choose Hide Slide .