Our team found the answer in case this helps someone else: total = total + Agency.instanceManager.instances[i].ContractID.value;

How do you call each instance and get the numeric value to calculate a total value? I'm stuck at identifying the syntax for each instance's value - here's the script for the calculated field: var f = guideRootPanel.tblAgencies.Agency.instanceManager.instanceCount;var total = 0; for (var i=0; i < f; ...