Where do you set outdial rules?

I need to have the system add an extra 8 since my Asterisk Server connects to another pbx to get out. Both require an 8 to dial out and right now the only way is to dial two "8"'s
I would like to set it up to just dial one 8 if possible..
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On the trunk to the other pbx
add 8+ (or is it just "8"?) to the Outbound Dial Prefix in the trunk setting under Trunks.
Eugene Blanchard
Author of PBX in a Flash for Newbies