If you have multiple presentations open, you can cut or copy a Topic and paste it across the presentations.
Note: Topics with mobile slides (.mprs) cannot be pasted into presentation files (.prs), and vice versa.
To copy/cut and paste a Topic across multiple presentations
This copies and removes the selected Topic from the Presentation Layout pane.
The Topic is added as the first Topic by default. If a particular Topic was selected when the copied/cut Topic was pasted, the new Topic is added below the selected Topic.