How to unroute the copper traces on the board at single execution?

Hi..
 
I had finished the board with of the top and bottom layer of traces with the 1 OZ of copper. There is some corrections made in the schematic and net list has been get updated, so i want to remove the existing traces and then some corrections want to be made in the pcb,

I had tried to delete the vertex of each traces one by one. can i remove the entire net completely  within an single execution, or either any possible command is there to be execute it.

Thanks & Regards.,,

Dhamodharan