Making Docks without instances of an icon on each dock made

Hopefully my last questions of the day....

Im making several docks, I can do this no problem

The problem is that when I load something like MSN Messenger for instance, it will appear on both docks...

Is there a way of keeping one instance of the icon, and only to the dock it was originally assigned to.

Eventually, I would like to make separate docks for different themes i.e. one for games, one for apps, internet etc.

Any help or advice would be gratefully received
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