There is currently not the option to create subfolders to aid organization. The feedback I have read has been marked completed but it is not actually showing up as an option. Within a folder you should be able to create as many subfolders as needed to organize data... currently, you can only add one folder under a main folder and there is no conceivable way to organize them (you can't even move them around to the order you choose). For example, 1) Main folder; 1a) sub folder 1a main, with 1a1) sub folder 1a1, 1a2) sub folder 1a2, 1a3) sub folder 1a3; 1b) sub folder 1b main, with 1b1) sub folder 1b2, 1b2) sub folder 1b2, 1b3) sub folder 1b3; etc.

You should also be able to import mail categories directly into the folder/subfolders opposed to the current label system (which doesn't quite make sense to me yet). The labels are disorganized and don't follow the same system from how they were organized before despite the names clearly showing the system of organization.