Open  Two Presentations to Compare and Combine 2. Try it: Compare Two Presentations The Advanced Options Complete. pptx presentation is open. Go to Review ->Compare->Compare. Browse to the Documents folder and select the original copy of the show. Click on Merge.   Keep going... Exam 77-883: Microsoft PowerPoint 2010 6. Collaborating on Presentations 6.2. Apply proofing tools: Compare and Combine Presentations Review ->Compare->Compare