Posibility of using a caculated value(of a table) directly in another chart?

[#1]

I made a table with a few calculated columns by using complex expressions. Then I have a total of each calculated column. I want to display these totals in a textbox, do I need to recalculate them in the textbox (which would be extremely complicated to do), do can I refer those numbers directly in the textbox??

Or is it possible to call a calculated field of a table? It would be using expressions like Sum(Potentiel€) in my case?

Thank you all very much!

[#2 · Accepted solution]

Why can't you use that expression in a variable instead of calculated expression? Then you can call that in your text box.

Thanks