Changing URL/PermaLink for “Essential Content types”

Hello all, I am using the Clean Portfolio theme, and am really liking it, however some of the essential content types are not neccesary for my use and I wondered if I could change the url/permalink. For instance I don't need testimonials, however I would love to maybe have something about CAD projects I am working on there. So currently the url is mywebsite/testimonials/post and I would love to change it to mywebsite/cad/post while maintaining the features of posting on the homepage etc. I know I can simply make a new page however, I cannot display multiple posts off of that new page easily. if i go to mywebsite/portfolio it shows all of my posts under portfolio and mywebsite/cad wouldn't do that, it would only show 1 post. I hope that makes sense! Please feel free to ask questions! Thanks, Jacob :)