Only a leaf node ASG may be deleted (i.e. not ASGs underneath it in the tree). If an ASG has at least one child ASG, those child ASGs must be deleted first.
To delete an ASG:
From the Access Sub-Group tree, select the leaf node ASG you wish to delete.
Press the Delete button. A dialog box appears warning you that if you continue the access sub-group will be deleted.
Click Yes. This operation is immediate. There is no need to press the OK or Apply button under the tab.