If you have an Array Text or Numeric type question, you can disable specific cells in the Array.
To accomplish this, you will be using a small piece of JavaScript code -- don't worry, all you really need to know is how to cut and paste.
Here's the code you'll need:
$(document).ready(function() {
$('input[name="value"]').attr('disabled', 'disabled');
});
And here's the video tutorial to follow along:
How to Disable Fields in an Array from Hosted in Canada Surveys on Vimeo.