1. Open the slide

2. Hold shift key down, and scroll to highlight all of the slides. 

3. Then push command on a Mac OR control on a PC and the letter c to copy all the slides.

4. Then go to your groups slideshow and highlight SLIDE 1.

5. Then push command on a Mac OR control on an PC and the letter v to paste the entire master copy slide show into Slide 1

:D !

YAY your'e Done!!