Adding a button and layers to all slides in a scene

I have imported a bunch of PowerPoints into storyline. I have 7 scenes. I'm trying to add a button, which triggers a layer, in every slide, in one scene. But when I go to slide master, the slides are combined by slide type and not by scene. Therefore, adding a button to a slide type, makes the button appear on all those slide types, in every scene and not necessarily on every slide in that scene.

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