You can use stylesheets and javascript to do this client side.
Let's say the element that contains the information you are wanting has id="billAdd". Have a link call a javascript function.
Code:
function changeStyle(){
target = document.getElementById("billAdd");
if(target.style.display=="none"){
target.style.display="block";
} else {
target.style.display="none";
}
}
That should display it and hide it for you.
If you want to do it server side you could have a check box and once the form is submitted, ColdFusion could check to see if that Form element was passed and then redisplay the page with all the information and now the billing address shown by cfif... you might want to incorporate this approach just to catch anyone who might have had javascript turned off.