ctb remain in it&x27;s original condition. . To help with the change, in Layer Property Manager I list all the layers by the Plot Style column, and adjust the colour to match e. If the drawing does not use plot styles, then only CTB (color-based table) files are listed. Plans should be plotteddrawn using a black and white plot style. In the listed Plot Styles select "monochrome. Kettering Town v York City. . red, to a particular style, e. .