Flex project & Dynamic Web Project

Focusing on "Sample 1: Accessing data using HTTPService", I'm looking to separate the Flex files into a separate Flex Project, while retaining the other code in the original Web project. I've gotten sample 1 to work by changing the following in main.mxml:

destination="catalog" useProxy="true"
to
url="... localhost:8080/samples/testdrive-httpservice/catalog.jsp" useProxy="false"

//url modified per forum restrictions

How can I configure the client flex project to handle the original code?

Thx & Regards

-d