Yes, you can add as many contact pages to your site as you like. Learn how to add pages.
Please note, however, that Yahoo! Site Solution's Contact Information area stores your business contact details and applies them anywhere you decide to use contact information on your site. If you decide to add another contact page, then, keep in mind that a map or form on this page will use the same contact information as the rest of your site. You will not be able to add a map and driving directions to a second address, for example, and submissions to your form will be delivered to the same email address used on your first contact page.