Manufacturing was any industry that fabricated products from raw materials on a large scale, by the use of manual labor or machinery, and carried out through a systematic process.
In 1986, Montgomery Scott posed as a professor from Edinburgh, when he visited Plexicorp in San Francisco on appointment to study their methods of manufacturing Plexiglass. (Star Trek IV: The Voyage Home)
In 2377, the Qomar devoted an entire holo-processing plant to manufacturing miniaturized versions of himself. (VOY: "Virtuoso")