Hi Sheila,

Normally you can use CONCATENATE in the calculation field of "Single Line" Collection with the variables being FirstName and LastName and the Collection Variable being Personal_Details.

=CONCATENATE((Personal_Details.FirstName)," ",(Personal_Details.LastName))

But it seems at the time that the space is not working correctly.  I have read on another answers post that it will be fixed in the near future.  (Notice the Name field in the first collection on the attached)

So since you cannot do it that way, JavaScript seems to work just fine.

// Autofill Field with variable 
$(document).ready(function () {
  $('.firstname, .lastname input').change(function () {
    $('.name input').val(($('.firstname input').val())+" "+($('.lastname input').val()));
    })    
  })

//End autofill with variable
 

This is using the variables FirstName and LastName in the Personal_Details collection with the CSS Class as "firstname" for FirstName and "lastname" for LastName and then using CSS Class "name" for the variable Name2 in the second collection