Deleting a model group Perform these steps to delete a model group. To delete a model group: On the DWD Designer, click the Data Warehouse tab. Expand the data mart. Right-click the model group to delete and select Delete. If you are deleting a parent model group, you can select: Yes to delete all groups under the parent model group. No to keep all groups. Note: The remaining model groups will move to the next level up in the hierarchy.