Start the Custom Show Now we have two copies of the Show Time presentation: the Original Show Time that included all of the slides and a Custom Show Time with less slides that we just saved.   You can choose which version of your show that you want to start.   4. Try it: Start Custom Slide Show The presentation is open. Go to Slide Show ->Start Slide Show. Click on Custom Slide Show.   You will be asked which Custom show you want to start. Select one.   Click Show and keep going.. Slide Show ->Start Slide Show->Custom Slide Show Exam 77-883: Microsoft PowerPoint 2010 8. Delivering Presentations 8.2. Set up slide shows: Show a Custom Slide Show