How to save slide as template

[Robin]

I made some simple graphics on a PP slide and now I want to save it as a template. How do I do this? Also, I made the graphics the only way I knew how, and the shapes I used went over the edge of the actual slide (it doesn't show on the slide which is the way I want it) but how do I "cut off" the stuff that is over the edge? There are several layers of colors and shapes....I don't know how to lock them together to do this.