Add/Modify EJB Groups - Weblogic Ejbs
To add a new EJB group, click on the Add EJB Group button in the right top corner of the page.
The elements that are already managed in the group will be listed in the Managed Elements in the Current Group list box. Other elements will be listed in the All Elements list box. To manage the elements and to add to the EJB group, select the elements from the All Elements list box. Then, click on the Manage 
icon. The elements will be listed in the Managed Elements in the Current Group. Finally click on the Update button to save changes.