Upon upgrading from ArcGIS 9.3 to 10.1 Beta 2, grouping of similar routines as methods under a geoprocessing service is not possible. It was found that more geoprocessing services were needed to be published, in order to solve this issue. However, we do suspect that WPS does play a part in causing this issue but we are not sure. Any help would be greatly appreciated.
I assume you mean you cant put multiple tasks into a single service? With the change to publishing GP Services you need to have the multiple results setup and ready in your ArcMap session. Once you get into the Service Editor you use the Add Result button to add multiple tasks into the service you are creating.