Is it possible to link an object (or set of objects) on one canvas to a copy of the the same objects on another canvas?

I use Omnigraffle to mock-up user interfaces for software. I find it useful to create a canvas that has scaled-down copies of the screens I mock-up (each on their own canvas)...

I use the canvas with the scaled-down copies to show the connections between the different screens. (For example, clicking a button on screen 1 takes you to screen 2.)

Is there a way to keep the scaled-down versions in sync with their larger copies?

Any suggestions would be appreciated. Thanks!