Quick question while upgrade in process

I'm in the progress of installing the 15.2 using oclp2.2.im at the step where I need to choose the partition on the disk and initially tried the one that I have the current Catalina but then it says I don't have enough free space. If I want to wipe the current os and install a clean one should I erase the Macintosh HD volumes partition? There are three options as you can see from picture attached. Please advise.