UNHCE Information Technology & Distance Education Blog

In previous versions of PowerPoint, you could only apply one
design template to a presentation. If you wanted to have more
than one, you had to jump through some hoops. Now, PowerPoint
2002 allows you to have multiple design templates within a
presentation. To apply a design template, first create the slides
with one design template. Then, to add another design template to
certain slides, in the Slide Pane select the slides that will
display the second template. You can hold down the [Ctrl] key and
click on non-adjacent slides. To select a group of adjacent
slides, select the first slide in the group, hold down the
[Shift] key and click on the last slide in the group. All the
slides in-between are selected. Then, apply a new design either
by clicking on the Design button on the Formatting toolbar, or by
right-clicking on a selected slide and choosing Slide Design. In
the Design task pane, select the template and it's applied to all
the preselected slides.

Courtesy of: Element K tips