TOPIC: Fax number

I am trying to add a field in the registration form for fax numbers. We often times need to send purchase orders to customers and most prefer the use of fax machines rather than regular mail.

I tried adding a fax field to a site in a development environment but had no luck. I just need to copy the phone field and rename it to fax and have it included in the automated e-mail and recorded in the back-end.

This is actually pretty important to customer service who fields e-mails from our site.

Anyone?