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From: DJ Delorie <dj AT delorie DOT com>
To: geda-help AT delorie DOT com
Subject: Re: [geda-help] PCB: bottom layer split
In-Reply-To: <alpine.LFD.2.20.1901131708510.24356@kai.zorinco.com> (geda-help@delorie.com)
Date: Sun, 13 Jan 2019 20:20:36 -0500
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"Christopher Nielsen (chris AT zorinco DOT com) [via geda-help AT delorie DOT com]"
<geda-help AT delorie DOT com> writes:
> But this is not saved? If I save the pcb and open again then  file->export 
> gerbers, it's back to the bottom layer missing the traces (on a different 
> board)...

It definitely should be saved. There'll be a line in your *.pcb like
this:

Groups("1,c:2:3:4:5:6,s:7:8")

You can manually edit the *.pcb in case it's corrupted that line in a
way that it doesn't save it right, but I don't recall that ever
happening.