When you Use color dependent plot styles you map each object to a specific plot style according to the object’s color on-screen. if you create new drawings from a template (or use Saveas) the new drawing will use the same plot style behavior.once you make a new drawing it will use either color dependent plot styles or named plot styles and you cannot change this.you must select the plot style behavior that you prefer BEFORE you create a new drawing.There are two different ways to use plot styles. You must first attach a plot style table to a layout with the Page Setup before you can use plot styles when you Plot. technical drawings used to make blueprints should normally be created using monochrome plot styles.objects retain their color on-screen but are sent to the output device as if they were black (white on black backgrounds).for example, lines may be faint or seem “pixilated”.One way to improve output on monochrome devices is to use a monochrome plot style that substitutes black ink for all screen colors.if you try to send color output to these monochrome devices your plots may not be of optimum quality.laser printers) produce output using only black ink or toner (i.e. you may want to change some object properties at Plot time (only) and this is what plot styles were designed for.

if your plotter can output objects as they appear on-screen (and if this is what you want) then plot styles are not required.You do not have to use plot styles in AutoCAD. Tutorial how to work With Plot Styles in AutoCAD

Edit autocad plot style