Hi Rick;
You need to expose the Web Service in SA by locating its Web Service Description Language (or WSDL for short). Most WS's that are deployed to either a J2EE or .Net web server can let you see the WSDL in your web browser via an http link (ie: http://<web server>/<ws root>/<web service>?wsdl.
For PB, you will need to make sure that your WS is built using SOAP (Simple Object Access Protocol). PB 10.x does not support other protocols.
FYI: Web enabling data on a SQL Anywhere Server using a native web service - CodeProject
HTH
Regards ... Chris