Can i create a sub-group for a device-group?

Hallo NA-Team,

can i create one or more sub-group for a device-group?

for example:
I will create a device-group for our LAN (name is LAN-DEVICES, is layer 1 in the group-hierarchy).
But our LAN have many different Subareas.

Our engineers want to report separate Subareas-groups (layer 2) to locate problems, not the whole LAN.

Second, i need a main-group for our WAN (layer 1) and sub-group (layer 2) for the countries (also may be location-groups within the country-groups).

Can i create one or more sub-groups(layer 2) within the device-groups LAN-DEVICES and WAN?

When yes, can i create more sub-groups (layer 3 in the group-hierarchy) within the first sub-groups (layer 2)?

Thanks is advance
and best regards

Helko