Grouping of datasets

I would like to group datasets so that it is easy to find the right dataset link on site.

For example - if I have a room book I would like to divide the rooms into subgroups:

• Room book

  • Floor

    • Top number

      • Room numbers

So I can then click on the corresponding dataset link on site more quickly by first clicking on Room book, then on the corresponding floor, then on the top number and then I only see a list of those rooms that are on this floor.