Delivery location group is an attribute of delivery locations.

Create a delivery location group
Click on , then enter the label for the delivery location group.
Click on to save the creation.
Edit a delivery location group
In the "delivery location group" menu, simply click on the delivery location group to modify. It is then possible to modify the label.
Click on to save the changes.
Delete a delivery location group
In the "Delivery location group" menu, simply click on the delivery location group to delete, then click , before confirming the deletion.