When user want to delete group then it is possible by deleting QSR group from inventory management module.
Follow below procedure to delete qsr group.

1. Open inventory management.
2. Go to QSR group tab.
3. There should be list of available qsr group.
4. Open qsr group.
5. At bottom there is one delete button available.
6. Click on delete button.
7. QSR group will delete successfully.
   
   
8. Deleted group will disappear from QSR group list.
9. As qsr group deleted, deleted qsr group should remove from linked modifier item and from qsr sub group.