When creating a custom DAM Asset schema, you must copy a default schema (so you will have all the standard default DAM Asset field options), then you should amend the schema; to add your checkbox field option. The default schema fields are recommended by Adobe, so when you are planning to remove default fields, remove them with care.
After copying a default schema to apply your own changes, you will realize that all default fields (cascading options like you said) will be visible.