Noob here. Searched around and seem to be a bit confused on the use of GroupInitiative. I want to be able to grab a group of tokens, roll a d20 for each, subtracting the value of an attribute I call "Avoidance" (if they are a token attached to a character), then rank them in the tracker by lowest roll. If a new group comes along, it will do the same, but add them at the bottom of the turn order. Can I beg instruction on how to do this? Thanks in advance.