Researching a clients request for a new website - best practice!

Hi all,

I’ve had a request from a client who has a current website. They want to build a separate website for sales.

The question is. What’s the best practice? To adapt the existing site to maybe have a portal on to be presented with ‘SALES’ and ‘SERVICING & POLISHING’

SALES area would only present all watches for sale etc
SERVICING & POLISHING area would carry all other information etc

Any advice would be appreciated.

David Lewis