These days, if you need artwork for your technical presentation, chances are good that you can not only size the artwork to fit your needs but also adjust the level of detail. A simple control of “layers” will let you select what to show.
But before computers, if you wanted two similar drawings but with different levels of detail, you had to manually draw the things. As an example. behold these drawings of an early Lockheed Space Shuttle concept, derived from the STAR Clipper concept. All three of them wound up in the STAR Clipper article I’m working on for issue V3N2 of APR. Coming from three separate sources, they each wormed their way into the article until I recognized that they were all essentially the same thing, and boiled ’em down to the last, and best, of the drawings.