Good morning, (New to Tiller so Hopefully not asking a question that has been answered)
I need either a sub-Category field or some other type of field to further sort my data. Thanks in advance
Groups should be your primary category, Categories your secondary/sub. See here. If you try to add another tier below Category, then I think it would break a lot of things and you’d have to rewrite many sheets.
Tags are a great way to accomplish more fine-grained categorization, and they are key to my own Tiller system. Initial guidance on using Tags here.