by Dent Cermak » Thu Jan 23, 2014 2:08 pm
You can set line weights two ways. One, you can assign line width under the Layer Properties Manager and maintain them in your *.dwt file.
Secondly, you can type "PLOT" and in the plot window, at the upper right corner, you will see a box for the "Plot Style Table". At the far right of that window is an EDIT button. Click on that and set the widths as desired. I save that file as a *.ctb (color table file) and use my custom file on every drawing. You can mix the settings so that you get black and color lines in plots as desired.