Calculating Totals

I have a form that the user enters in a quanity and it totals it for each item ...

I looked at several posts on how to do this and have got it ...

However how do you total all the totals from each item ?

Here is what I wrote for a function ... IS my last function correct ?
And then how do I have a text box with the total displayed as they input the items on the order form ?

             function sumUpdateQMgr(f) {
          var x1 = f.Qty1.value * 1295.00;
          f.TotalQMgr.value = x1.toFixed(2);
        }
              function sumUpdateJbCtrlFm(f) {
          var x2 = f.Qty2.value * 49.95;
          f.TotalJbCtrlFm.value = x2.toFixed(2);
        }
        
              function sumUpdateTotalConditionRpt(f) {
          var x3 = f.Qty3.value * 21.95;
          f.TotalConditionRpt.value = x3.toFixed(2);
        }

            function sumUpdateControlBinder(f) {
          var x4 = f.Qty4.value * 54.95;
          f.TotalControlBinder.value = x4.toFixed(2);
        }
        
              function sumUpdateProcedureBinder(f) {
          var x5 = f.Qty5.value * 54.95;
          f.TotalProcedureBinder.value = x5.toFixed(2);
        }
        
              function sumUpdateEmployeeManual(f) {
          var x6 = f.Qty6.value * 5.50;
          f.TotalEmployeeManual.value = x6.toFixed(2);
        }
        
              function sumUpdatePresCD1(f) {
          var x7 = f.Qty7.value * 99.95;
          f.TotalPresCD1.value = x7.toFixed(2);
        }
        
              function sumTotalSale(f) {
          var x8 = f.Qty1.value + f.Qty2.value + f.Qty3.value + f.Qty4.value + f.Qty5.value + f.Qty6.value + f.Qty7.value ;
          f.TotalSale.value = x8.toFixed(2);
        }


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