I am a developer about to start work on a clients website that is using CW3 and I am new to this software. He wants to create a kind of micro site type thing for his new wholesale store where you click on a link from the normal store and then it asks you to login as a wholesaler. He wants this section to have it's own products and customer database but keeping the same design of the regular online storefront.

What would be the best way to implement this in CW3?
I'm thinking I should make a new installation in a sub folder and copy over the design template, right?