Ouch, gratuitous prints! At the moment there's no PHP whatsoever, so all that could just be plain HTML. Then put the PHP in where it's needed. Much faster, and much easier on the eye and editor.
You're awfully vague in your question, though. Session variables would be simple enough for the task.
The first line of the page is <?php. The second line is session_start();.
Stash the form's posted variables into session variables - give the session variables default values if some of the form fields are empty (all of them will be empty the first time the page is viewed) so as to prevent further warnings. Eg., for customerInfo[customerAddress1]:
if(isset($_POST['customerInfo']['customerAddress1']))
$_SESSION['customerInfo']['customerAddress1'] = $_POST['customerInfo']['customerAddress1'];
else
$_SESSION['customerInfo']['customerAddress1'] = '';
(It could be done a wee bit quicker, but this is probably safer. If you want form fields to have default values, use them instead of using '' here.)
You'll want to update the session variables in the processing page as well, in the same way.
Then comes a ?> Let's not use PHP except when we need to.
Then the HTML of your page.
Now go back through the HTML, and give value="" attributes to all your form fields. The value will come from PHP as follows (again, for the customerInfo[customerAddress1] field):
value="<?php echo $_SESSION['customerInfo']['customerAddress1']?>"
That's one way of perhaps doing it. I don't use this method myself, but much of the principle is there: when you receive form data, stash it in session variables from which you can extract it later if need be.
