Compound_Amount Sum of 3 Compounds in a 6 compound batch

Hi all, 

I am running triple omega analysis. There are six peaks (including the ISTD). I have my Compound_Amount column giving me my concentrations. I would like to Sum 3 out of the 6 peaks and cant figure out how to do it.  I can sum the whole column but cant figure out how to pick certain peaks to sum. Any advice for this problem?

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