two textbox into one combobox

Hi Identify,
To do this, enclose any combinations of field names in braces (curly brackets '{ }').
Optionally, you can also include text where appropriate (or unicode characters if relevant to your project and you want to get creative  ).
For example

{firstname} {lastname}

Or

First Name: {firstname}  Last Name: {lastname} 

See examples in the attachment.
Regards,
Derek.