How to Add Section Title and Subtitle on Every Page in InDesign

Hello, 

I’ve added section markers to title each section but i need to add a subtitle as well that also appears on every page of the section, I’m not able to add another section marker with text. I tried using a running header or defining my own variable text but I can’t figure out how to use it, I’m not sure if the issue is that I’m doing it all in one document instead of a book? 

Some help would be very appreciated! 

Thanks :)