1. function setupGridRefresh() {
   var targetgrid = document.getElementById("NAME OF SUBGRID");
   
   // If already loaded
   if (targetgrid.readyState == 'complete') {
       targetgrid.attachEvent("onrefresh", subGridOnload);
   }
   else {
       targetgrid.onreadystatechange = function applyRefreshEvent() {
           var targetgrid = document.getElementById("NAME OF SUBGRID");
           if (targetgrid.readyState == 'complete') {
               targetgrid.attachEvent("onrefresh", subGridOnload);
           }
       }
   }
   subGridOnload();
   }
   
   function subGridOnload() {
   //debugger;
   var grid = Xrm.Page.ui.controls.get('NAME OF SUBGRID')._control;
   var sum = 0.00;
   
   if (grid.get_innerControl() == null) {
       setTimeout(subGridOnload, 1000);
       return;
   }
   else if (grid.get_innerControl()._element.innerText.search("Loading") != -1) {
       setTimeout(subGridOnload, 1000);
       return;
   }
   
   var ids = grid.get_innerControl().get_allRecordIds();
   var cellValue;
   for (i = 0; i < ids.length; i++) {
       if (grid.get_innerControl().getCellValue('FIELD NAME LOWER CASE', ids[i]) != "") {
           cellValue = grid.get_innerControl().getCellValue('FIELD NAME LOWER CASE', ids[i]);
           cellValue = cellValue.substring(2);
           cellValue = parseFloat(cellValue);
           sum = sum + cellValue;
       }
   
   }
   
   var currentSum = Xrm.Page.getAttribute('DESTINATION FIELD').getValue();
   if (sum > 0 || (currentSum != sum && currentSum != null)) {
       Xrm.Page.getAttribute('DESTINATION FIELD').setValue(sum);
   }
   }

You need a field on the Account record which is updated every time you:

• create a greatpeople.me  Portfolio record
• update the value in a Portfolio record
• delete a Portfolio record
• re-parent a Partfolio record from one Account to another