Firewall Manager - Template

Hello, I am start to use Firewall Manager to manage three XG Firewall (XG1, XG2, XG3)

I am bit confused how to manage the firewall using the group. I found only skinny documentation....

I try to speak me better

I would like to manage the firewall using differente group

Group 1: XG1, XG2 --> peripheral firewall

Group 2: XG3 --> Central firewall

How to add specif firewall under different group? the System Management > Device Settings > Managed Devices > Device Group, don't let me to specify the dedicated firewall but only some specific criteria that don't let me to correctly manage the group

The group 1 need to have their own policy (network policy, ipsec policy)

The group 2 need to have their own policy (network policy, ipsec policy)

How to make it?

How to push policy?

I don't understand the difference between.

- Template Configuration --> Policy

- Device Configurarion --> Policy

Also, is possibile to use an alias host, where a specific object take on a value when I push policy to a different firewall (belon to the same group device)?

Sorry for too many question but I need to undestand if the product online with my requirement

Thank you