It would be helpful if the references throughout the model to subsets of lists appear where you click on General Lists and have the three reference columns over to the right. Having the subset references separate, you have to click on the list, click into the subsets tab, and then scroll to the right to review the three reference columns. Since it is still all part of the list it would make sense for it to appear in the general lists. When going through all of the references to a list (for any reason) it is painful to have to remember to click into the subsets and check those references separately from the full list.
