I need to import full size raster (pdf, tif) architectural drawings and trace them in AS 9 layers. The raster images are not reliably to scale. Can I, on an AS layer, select 2 points of known dimensions, and use those to set the scale for the SKF drawing? For example, select from the underlying raster image 2 scaled points called out as 24" apart, on an AS layer draw a line between them, and declare that line to be 24" in the SKF. Thank you.