ABN Tax Number

Is it possible to ask a new customer to enter their ABN (Australian Business Number) during new customer log in?

There is no box or question for this in my Zen Cart log in.

Is there a way to put this into new customer log in?

I wish I could :unsure:

o What version of Zen Cart? v1.3.9h
o Is it a new install or an upgrade? New installed on my server Just Host. I am editing it there.
o What the addons/contributions you have installed? Non
o What customizations have you made? Created custom Template. Moved text and boxes form home page. Setting up categories etc
o What type of server are you using? Unix-based servers on JustHost.com
o Are you installing locally? It’s already installed on my host. I am editing it there.
 What operating system? Windows 7
 What version of PHP is installed on the server? PHP 5.2.16

o
o What version of MYSQL is installed on the server? MySQL server version 5.0.91
o What you were doing when your problem occurred? Editing my home page
o What are the steps to reproduce the problem?
o Have you attempted to fix the problem? Reading FAQ and trying instructions found there.

This, maybe. I haven't used it, and don't know if it'll work with 1.3.9, but it's worth a try.
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http://www.zen-cart.com/index.php?main_page=product_contrib_info&products_id=1188**