hi probably didn't explain myself too well.
I wanted the BG image to work as Modo. When i add an image it comes in at 100%. I would then draw a circle say 100mm dia. to match the 100 mm dia. flange on the image. At this point i would scale the image of the flange to match the circle i just drew. Now i am drawing at the correct unit size.

At this point i would need to add the other images in the other views, but instead of going thru the process again it would be good to know at what percentage i scaled the first image so i can simply set the remaining images to exactly the same scale. Then would just have to worry about getting the image into the correct location.

Hope this clearer . . .

matt