Power Pack Guide > Copy to slides
This feature allows you to copy any object(s) to the slides you select
Once you have copied an object to other slides you can also remove it from all slides at once.
What objects can I copy to all slides?
You can copy any PowerPoint object (i.e. pictures, shapes, groups of shapes, textboxes) to other slides. The one object you will not be able to do this for though is placeholders. As this is something that can only be placed within a slide master.