When you scale your view in the plotted drawing or paper space, you can use the standard scale list from AutoCAD in the property manager of the viewport instead of using the old method XP factor…. But if you cannot find the scale, do not worry. You can always add or modify the list of scales in the dialogue box. It is really simple: From your AutoCAD command type SCALELISTEDIT. Select the scale from the list to modify. If you need to add more select the “ADD” button. When the add scale dialogue pops up, name your new scale and change the “Drawing units” according to your scale. Hit “OK ” and you are done. Pretty simple! Take a look at our handy list of scales available for your use here http://2learncad.com/blog/2010/02/engineering-architectural-scale/