DayZ-Epoch/SQF/dayz_code/Configs/CfgServerTraderZSC

To customize config traders copy this CfgServerTrader folder to your mission.

Then in description.ext replace this line:
#include "\z\addons\dayz_code\Configs\CfgServerTrader\CfgServerTrader.hpp"
with this:
#include "CfgServerTrader\CfgServerTrader.hpp"