Mass Apply Triggers

Hello.  Our small organization creates webinars for our membership using Storyline 2.  I am given a PowerPoint with recorded audio, that sometimes pushes 100 slides.  Currently, I am creating triggers of each slide, that will "Change the state of the Next Button to Hidden when Timeline Begins", then creating another trigger that will "Change the state of the Next Button to Normal when Timeline Ends."  This ensures that a viewer cannot simply click next until the audio ends.

Doing this works, but I have to copy and paste on every slide the "Hide" trigger, then copy and paste on every slide the "Normal" trigger.  It is very time consuming. 

Is there a way to apply these triggers to all slides at one?

Thanks for any help.  I tried to Google this but couldn't find someone asking this question directly, and receive a response with an appropriate answer.

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