Expression for Custom Calculation

I'm using MassHunter 10.0 to quantify glycerides in biodiesel from GC data. I'd like to create a custom calculation in Report Builder 10.2 to calculate total glycerin. I have created compound groups to quantify the Mono, Di and Tri glycerides. The bound monoglyceride would then be 0.2591 * [MonoglycerideGroup]. The bound di and triglycerides are calculated in a similar fashion. The total glyceride would then be the sum of the free glycerin, bound mono, bound di and bound triglycerides.

Is this a task best done in the Quant program? Or is an expression in Report Builder the preferred method?

Is there a standard resource available for building expressions in Report Builder?

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