Datasets feeding PI Calculations - is this possible?

Hi all,

Looking for some advice again - I would like to know if the following is possible using Datasets and PI Calculations in ProcessBook - if possible, without a Performance Equation.

I have 3 Datasets, showing "mass flow", calculated by the following.

Tag Load A = ‘Flowmeter1’ * ‘Conc1’ * 0.024

Tag Load B = ‘Flowmeter2’ * 9.288

Tag Load C = ‘Flowmeter3’ * 9.288

I would now like to add these together... and have a running totaliser.

Tag Load Total = TagTot(‘Tag Load A’,’t’,’*) + TagTot(‘Tag Load B’,’t’,’*) + TagTot(‘Tag Load C’,’t’,’*)

However, I don't know how to get my PI Calculation in ProcessBook to recognise "Tag Load A" etc the same way it recognises field tags. Is this even possible, or do I need to have "tag load a" inputted as a performance equation tag before it'll work?

Thanks, look forward to any feedback you might have.