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AutoCAD comes with a number of linetypes: continuous, dashed (various lengths), dotted, dash-dot, border, center, and so on. But you can make your own. A simple linetype is just a pattern of dashes, dots, and spaces. (A complex linetype can include text and shapes, but that's another tutorial.)To create your own simple linetype, follow these steps:
AutoCAD Tips Blog - by Ellen Finkelstein