Integration

Dear All,
I am new to OSB and I have a use case that I need to solve. I have 3 web services and I imported their WSDLs into OSB and created 3 Business Services that goes with each WSDL. The scenario is like this.

Business Service 1: takes an input value as [Region] and returns a list of employee names.
Business Service 2: takes the list of employee names and returns the list of employee names with their job profile
Business Service 3: takes the list of employee names with their job profile and returns their contact information.

I need to return the result of Business Service 3 to the consumer. The consumer basically need to call the Proxy service with [Region] as the input value and the result should be the output of above Business service 3.

As I mentioned, I have WSDL for all the 3 Business Services, but, I do not have the WSDL for the Proxy Service. The Business Service WSDLs are all different and they do not match.

My question is it possible to achieve the above result without having a concrete WSDL for Proxy Service? Also, how can I go about solving this use case. I have gone through some articles that talk about Split-Join, and am really lost.

I really appreciate your kind reply on this.

Thanks in advance.

Regards,
Syama