About SAP B1 Web Application

Dear All,

I am working on SAP B1 from last 3 years. I am working on SAP B1 2007 B. I have made the addon by VB.net and the addon working fine. But now my company wants to get the web service of SAP. Now my question is whether i can use the same addon on B1WS or i have to code from the scratch. How i overcome this problem.

Please suggest and how i start to developfor SAP B1 web service.

Bodhisatya