Sometimes you need to insert an image of the drawing for practice,but having that in one display window could be impractical sometimes.
If you do not know how to create multiple display windows in your model space this tutorial will make your life easier.
Just type VIEWPORTS.
You will get this,here you can choose a type of a viewport you want.
Is it going to be Two: Vertical , Three: Vertical is up to you and up to your needs.
Click OK when you choose your viewport.
I have created two vertical viewports.
Whatever you draw in the first viewport will be represented in the second viewport.
As I said this is up to your needs,this is just a way how you can do that.