Chart Data Source Question

Hi,
I have some basic code to create charts from a datasheet. The line which references the data source looks like this:

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I'm trying to figure out if I can replace some of those cells with previously declared variables or just numbers. So instead of G102, I can use Var1 instead, which might be the sum of a few other cells.

Thanks for any help.

Thank you for answering.
I have tried using series instead of what I have now. I'm wondering if it's possible to use cell coordinates and normal numbers in the same line. Could I do that with a series?