So I used a premade theme for my website, and 90% of it is mobile optimised, but there are certain aspects that are not, I need to make a new layout for mobile and tablet resolutions, but wanted to clone the layout from my main website so that I could easily transfer over the 90% that works, then amend the 10% that is poorly optimised for example the logo that is far too big on mobiles.
How can I do this? I've attached a photo explaining what I mean. I'd like to clone everything in main to mobile.
Thanks!