Drop Down Menu and Slide Master

I have created a course in storyline, using all blank screens. I have also created my own drop down menu, thanks to a post from Tom, that I tweaked so it links to other slides. I would like to use the Slide Master to add in the Menu so I don't have to place it on every slide. However, I do not want the Menu displaying on every slide since I have some web objects imported and I don't want the Menu on the first or last slide. The problem is that all my slides are blank ones, so using the blank Slide Master means it shows on all the slides.

Is there some way it can not display on specific slides?

Thanks,

Melissa