How to create named STB settings for different scaled plots?

I have AutoCAD LT 2013 for MAC. Can I use Named STB settings to control lineweights for plotting drawings different scales? For example, plotting the same floor plan file but using different Named settings so that A-WALL layer plots less thick when plotted at 1/8" scale, than when plotted at 1/4" scale? How do I go about doing this or setting this up? Is there a website or video link I can visit? 

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