Customize the scale without changing the size of the drawing

[Virgile38019335sdw5]

Is there a way to customize the scale space?
My unit is the millimeter, for example if I have a line which Illustrator measures 75mm but which actually makes 600mm. How can I change the scale so that my line doesn't change dimension on the drawing but the measurement shown in the properties is 600mm? Thanks. 

[Ares Hovhannesyan · Accepted solution]

I am not aware why you need that , but may be you can use Dimension tool property tool to show that visually. What is your general task?

[Virgile38019335sdw5]

@Ares Hovhannesyan Indeed, I wanted to draw 600mm lines, but I just realized that all I had to do was change the size of my sheet. You've introduced me to a new feature. Many thanks for this!