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I believe you're referring to the "Summation" property in SLDs. If you look at your toolbar containing the diagram options it's the little "Σ" on the far right. A box with some instructions should pop up.
For more info in PSS/E 30 you can refer to the 2.19.9.4 in the Users Manual or for PSS/E 32 see section 3.8.3 in the GUI Users Guide.
As far as I know there aren't any API's for this functionality. Good luck!
