If I wanted to change the low end on a section of audio which is something I do regularly on vocal takes for plosives, is to just select the section and Ctrl + right click to bring up the plugins menu, then find the eq of my choice, hit preview if you want to hear what it’s going to sound like first, then hit process.
It’s all done and if you want to change later at any time you just go back into the offline process history and you can undo or redo etc etc.
Off line processing is very handy 
MC