Good Afternoon Divya Arunachalam.
From within the SC-UI, you can start from the following page(s):
- Login to the SC-UI
- Goto Administration>Tools>Links>Web Services API
- Open Catalog Web Service
In there, you'll find the WSDL methods you can use to build offerings etc.
E.G. with the (to be downloaded) SOAPUI-utility, you could then execute these WSDL methods.
Kind regards, Louis.