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The reason that you can't find anything on this is that your basic design is not a good option to use.
Each record in this table has fields to accommodate up to 10 category-feature combinations, such as Cat1, Feat1, Cat2, Feat2....Cat10, Feat10.
Instead of multiple fields, set up a related table of records with one category and one feature field to each record. You now have a relationship to a single Category field to set up the needed conditional value list for a single feature field.
If you stick with your approach, you'd need a different table occurrence and different relationship for each of your category fields--which compounds the complications inherent to your current design that are simplified if you use a related table of records.