Step 1: Navigate to the Deck that you want to add a presentation to. From there, select the "Create Presentation" option from the right side.

Step 2: Fill out the necessary information within the new menu. The main section you will want to complete is the "Title" so that it is easily searchable.

Step 3: Click "Next" and then select the Presentation Flow which you would like to continue with.

Step 4: After selecting your flow, you can select the slides you want to use from the Master Deck. You can "Select All" for every slide to make adding this easier. You can even select an entire chapter if you want as well.

You can also navigate easily between all of the chapters by clicking the "Chapters" section on the top and seeing the drop-down shown here.

One other feature that is helpful is the "Preview" feature within this section. If you need to see the slide you are selecting bigger, you can hit the magnifying glass next to a slide to see a bigger image of that slide.