Calcul individual percentage aginst total summarised values

[LBC2]

On my report I have a set of specific values that I sum.
I would like to calculate the percentage of each value compared to the total of all values. Obviously the total value is known only when the report is done. I did this a long time ago, but just do not remember how to do this.
Any Hint?
Thanks
Louis (Using XI)

 

[kenhamady]

{Field} % Sum ({Field})

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