Sorting subfolders among tags

In the left-hand column of the DT main page, I would like to keep the top-level tags (and groups, for that matter) unsorted (so I can arrange them in the order I want) and then have individual subfolders (ie, subordinate tags) sorted. For instance, I have a top-level tag called “Dates”, and I’d like the tags within that tag to be sorted numerically (ie, “1962”, “1963”, “1964” etc.) I’m new to DT, so maybe I’m using the wrong terms for all this…