Hi Ritesh,
If all you want to do is call the three services, create a new service of your own in minilang with three call-service actions. When you're invoking a service, it makes no difference how it was implemented.
An example of a service that calls several others is at
https://fisheye6.atlassian.com/browse/ofbiz/trunk/applications/accounting/script/org/ofbiz/accounting/payment/PaymentServices.xml?hb=true#to354Cheers
Paul Foxworthy
Ritesh K Kaushik wrote
I am Ofbiz newbee, how to use group sevices to invoke two services of type "java" and one simple ofbiz service.