Yes it is possible.
But you will have to furnish data to the web services in order to create the groups (Name, Type, Administrators, et then populate them).
Open your Public Adress Book in the Notes Designer and you will see a design structure named “Web Services”
You can write here your WS with LS or Java.
You have a sbutton to generate the WSDL file in order to integrate with your consumer clients.
The end point URL to consume will be something like