SUM
function SUM(): number | string | booleanDescription
Adds all the numbers in a range of cells.
Returns
number | string | booleanTry It
var oWorksheet = Api.GetActiveSheet();
var oFunction = Api.GetWorksheetFunction();
oWorksheet.GetRange("A1").SetValue(oFunction.SUM(145, 37, 236, 69, 567, 92));