Creating Fictitious Company Sites without Conflicting Styles in Relume

I'm making some websites for fictitious companies I made up, coz I feel that not having a portfolio is killing my sales potential. What I want to do is have these sites as a folder under /portfolio/site-name.. But I know there's the global styles and the style guide for each site made with Relume. Is there a way to do this in Relume where I can have a complete site under a folder and it would have its own unique class names etc. so it doesn't interfere with my core website styles?