
can assign only one background page to each foreground page, but each background
can also have a background, so you can create a layered effect. When you assign a
background to a foreground page, the shapes on the background are visible when you
display the foreground page, but you cannot edit them from the foreground page. To set
background pages, choose File > Page Setup > Page Properties from the main menu.
If you want to selectively view, edit, print, or lock shapes in a drawing, or to have
several layers of text and shapes within the same page, you should use layers instead of
a background. You use layers to organize related diagrams and parts ...