Logical linkage can be used to do what you are trying to achieve. You can create a hierarchy for the various "categories" you desire to track, something like:
Scientific Disciplines
+-Life sciences
+-Drug Discovery Research & Development
+-Discipline 3
...
+-Last discipline
You can then add your documents anywhere in the Ultra Recall database, then link this same document to any number of these "discipline" items to link them appropriately. You can then use the virtual "Lineage" attribute in an Advanced search to locate all items that belong to the desired discipline (or the entire Scientific Discipline root item).
You can continue to use custom attributes for other metadata for your various documents and items in Ultra Recall and could use the same method above to describe another completely different set of criteria for your documents...
Hopefully this yields some ideas to better organize your information with Ultra Recall.
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