It used to be that setting up different room charge accounts for different people within the same room, or setting up different limits for different people within the same room, was difficult to do. And at times, cast members didn’t know how to do it and even said it was impossible (when it wasn’t); front desk cast members weren’t properly trained in what was called a “share” procedure, and getting it done required help from a supervisor or someone in rooms control . Anyway, it was a big hassle.
However, since December, Disney has been phasing in a new system at the front desk. One of the cool changes is that the new system allows a separate room charge limit to be set for each Key To The World card within a room, and allows for easily assigning a separate room charge account for each KTTW card (if that is desired).
Reportedly, the front desk staff have been well-trained in these new procedures, and can easily make such arrangements upon request.