Hi Mark,

Your attachment didn't come through so I may be missing something in my response, but you have two options if you're using Forms 10.1 - the first option only works in 10.1 (or later).

For the following examples:

For the table, the variable is "Table", css is "table"

Amount 1: the variable is "Amount1", css is "amount1"

Amount 2: the variable is "Amount2", css is "amount2"

Subtotal: the variable is not used below, css is "subtotal"

First option is that you can use the Advanced-Calculation setting in your "Subtotal" field options per the changes for 10.1 with the following format:

=SUM(INDEX(Table.Amount1,ROW()),INDEX(Table.Amount2,ROW()))

Second option is to do it via JavaScript - credit to John Hanlon in his 7 April post which helped me work it out:

$(document).ready(function () {
  $('.table').on('blur','input',function () {
    $('.table tr').each(function () {
      var amount1 = parseNumber($(this).find('.amount1 input').val());
      var amount2 = parseNumber($(this).find('.amount2 input').val());
      var subtotal = amount1 + amount2;
      $(this).find('.subtotal input').val(subtotal).trigger('change');
    });
  });
});

function parseNumber(n) {
  var f = parseFloat(n); //Convert to float number.
  return isNaN(f) ? 0 : f; //treat invalid input as 0;
}

I'm still learning this stuff too, but setting up a sample form in 10.1 worked with both of the above options.

Cheers,

Mike