While it is pretty easy to copy and paste slides from one Google Slides to another this can help you with a more complex transfer. Use http://alicekeeler.com/copyslidesto This will allow you to paste the link to a destination Google Slides and the link to a Slides you want to copy from. Enter the slide numbers one at a time (per row) to indicate which slides you want to copy over. This allows you to have a slow release of slides rather than sharing the whole thing all at once. You can also push them in weird orders like slide 30, 2, 26, 9, 81... or even repeat pushing the same slide 41, 5, 78, 5, 23, 5, 56, 5, 91, 5. You can update the push and pull links easily and use the Add-on menu to push new slides as many times as you want.