Choose the parent action of the sub-action you wish to modify
Choose the specific sub-action you wish to modify
Sets the new "weight" for the selected sub-action, which is the probability, relative to the other sub-actions' weights, that the sub-action will be chosen.
For example, if all sub-action weights are the same, then they will all be equally likely to execute.
If one sub-action's weight is double another's, then that sub-action will be chosen twice as often.