What is it that you want to do with groups. The CSDK already allows the usage of groups. From our documentation:
: Oracle Calendar Groups can be invited using a non-standard (but legal)
: ATTENDEE property of the following form:
: As suggested by the example, the property value (MAILTO:email@example.com)
: is NOT used. In this example, the group "developers" will be expanded and
: the members will be invited as calendar users. When fetching this event, the
: members of the group (at the time of the call to CSDK_StoreEvents) will be
: returned as individual ATTENDEE properties.
: The server does not enforce uniqueness of group names - if multiple matches
: are found, an error will be returned.
If you mean manipulating group members, that is not available through the SDK or command-line tools. However, we are asking customers to move away from calendar-only groups and instead use more flexible LDAP-based groups. LDAP-based groups allow for manipulation of members using standard LDAP tools.