The SmarTeam Teams as well as the PLM Responsible Project Groups (RPG) and Design Code groups are based on the "e-group". These can be updated independently by users without the use of CAD/PLM support is required. This requires using the e-groups application.

To learn more how to add and remove people from a Team, please consult the following document.

More: How to add or remove people from a Team?

Even if the document refers to SmarTeam only, the way it works for the PLM is similar.
Go to the Profile Card of the RPG or Design Code group to identify the e-group name.

Example:

Note if for a Design Code group, the "Is Egroup" property is not ticked, it means that the group is still owned by CDD. In that case, contact cdd.support@cern.ch to be added