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Date: Fri, 20 Nov 2015 13:13:24 -0500
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From: DJ Delorie <dj AT delorie DOT com>
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Subject: Re: [geda-help] Thermal pad
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>      Before I run into any unnecessary difficulties in layout I'd better 
> ask the experts.  It's a DDA package, an SO8 with a thermal pad.  It was 
> simple to add a pin  9 as a square pad inside the pins.  My question is 
> what is the best way to add half a dozen vias to the pad that connect 
> electrically and thermally to the ground plane below?  Regards Ian.

Add them as pins (all numbered 9) and set the thermal flags in the
footprint accordingly.  You can also fiddle with the nopaste (I think)
flag and add smt pads (also numbered 9) to pattern your paste
accordingly.