If i want to make a multi optimization between three objectives

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The model is designed on design builder and then i extract the idf file to be used through matlab (using energy plus co-simulation toolbox) to make the multi optimization genetic algorithm. My question is that there are more than one value for each variable. So where is these numbers will be assigned are they going to be inside the idf file or through the matlab code?! If anyone used the co-simulation with multi optimization please help