Improve Robinhood: Make it possible to organize my portfolio via /r/RobinHood

We should have the option of organizing our portfolio. I want to see how my energy, tech, China, etc. stocks are doing. Robinhood does not need to categorize each stock themselves — just let us create "folders" or something along those lines, and let us see how each "folder" is doing. For example, if the stocks I put in folder 1 make up 30% of my portfolio, I want to see how they are doing compared to folders 2 and 3. It'd be a nice feature and would not require heavy lifting from a technical standpoint.