Link to a specific slide in another presentation

Select the object you want to use the link on.

Click Insert - Hyperlink - in the dialog box under link to the option Existing file or web page should already be active.

Browse to the folder that contains the presentation you want to link to and select it.

Now on the right of the dialog click the Bookmark button.

Select the slide you want to link to in the list that appears and click OK two times.

Now when you start the show and click your object the other presentation will start with the chosen slide. When you're done showing the slide press Escape to return to your original presentation.

Unfortunately there will be a hyperlink warning urging you the link may be unsafe.

To avoid the message from appearing just add your folder to the trusted locations in the trust center (File - Options - Trust Center -Trust Center Settings).