Is it possible show difference between two graphs in cacti?

I have cacti with a lot of graphs (interface statistics) and I need show the difference between two of them. Something like traffic=traffic1-traffic2 where traffic1 and traffic2 are interfaces on two separate switches.

Is it possible?

Yes, its possible. For a good example of a similar, but not exactly the same, howto read the following thread and examples:
http://forums.cacti.net/viewtopic.php?t=8532

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