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how to delete all nets


is it possible to delete all nets from a pcb. I got in a bit of trouble with naming nets and I wanted to start from scratch a draw new tracks between components without it referring to previous nets and giving errors.

If I try to delete a net from the list displayed in design technology it just says net is in use and can't be deleted although I have removed all tracks between components.

I have found a very laborious method, which may be the only way.....I removed every component net connection from the the net it thought it was connected to...and then deleted all unused nets from the design technology net menu. Very time consuming, I'm thinking there must be a method to remove all net connections when there are no tracks on the board.

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