According to [Ziggy Dziegman](https://productforums.google.com/forum/#!topic/docs/Uf-Ev1ThPtg) Jun 2, 2014 it is not possible at present. From your Title (singular) you might move a side to the end of the presentation and stop presenting before it. From the body of your question (plural) you might copy the presentation and delete the slides you do not wish to show.