Hey, any tips on how to isolate the copper area build(bottom layer) from circuit ground. I'd prefer my copper area to act as a shield and connect to chassis without my circuit ground also connecting to chassis at this point. I seem to have been able to do this before when I built a PCB without a schematic link. I have tried changing the net of the copper area to "shield" but then it disappears. Thanks for your help.
Brand new interactions and interfaces. 
Easy to use and quick to get started. 
Opps, Solved by selecting "Yes" to "Keep Island" on the copper area properties