I'm attempting to port a "press your luck" dice game into Roll20, and I have a question. They game uses multiple custom d6's. The players roll their dice, choose to keep or discard some, and re-roll the discarded dice a couple of times. I've made a rollable table for the custom dice, but I have no idea how the players would choose which dice to keep or re-roll. Is this something I can do in Roll20?