We would like to do proxy pass to alias a URL 1 with URL 2 (with a virtual directory) but using the same content for URL 1

We have two load balanced sites through the F5, 'http://www.richmondamerican.com' and 'http://how-to-buy-a-home.richmondamerican.com', both using 2 different IP addresses. We would like to do proxy p...