Switch to the Device Groups section of the Device Management Service.
Click on “Create Group” and assign a name, optionally also a group description and tags, so that you can sort your group faster later. Then open the group, switch to the Device tab of the group, click on “Assign Devices” and select the devices that should be displayed in this group.
Now click on the pencil icon in the gray area on the right and then on “Upload Image”. Now select an image from your computer, e.g. a terrain plan. Now you can click on the devices below the image, place them on the image and drag and drop them. Click on “Save” to save your changes.
Devices can be inserted in several different groups.