Yes, and the way to do this is by using Price Lists. By using Price Lists you can save a list of different prices (in a different currency if you choose) and apply them to your products. Instead of having to change prices of each product every time you send a Presentation, you can just switch to the Price List you want displayed.
1) Add a Price List to your Showroom
2) Add the new Prices, either manually or via Excel template import
3) Choose which Price List you want displayed on your Presentation
To learn more about how to create and apply a Price List, see this article.
Note: The number of Price Lists you can create depends on your subscription level, upgrading your plan will give you more access.
To learn more about upgrading your subscription, see this article.