Add a hyperlink that opens another Keynote file.
Select the text or object that you want to turn into a hyperlink.
Click Inspector in the toolbar, click the Hyperlink inspector button, and then select “Enable as a hyperlink.”
Choose Keynote Slideshow from the Link To pop-up menu.
Navigate to the file, and click Open.
If you want to change text that appears as the hyperlink in the document, type new text in the Display field.
When you click a link to another Keynote document, the new slideshow begins playing from the first slide.