You can delete a storage group as long as no logical disks are assigned to it.
Note:
If you attempt to delete a storage group that has one or more logical disks assigned to it, the system will prompt you to first move the logical disks to another storage group and then perform the Delete operation.
To delete a storage group
On the Storage Groups page, select the storage group you wish to delete.
Click the Delete button. The Confirm dialog box appears.