Hi @mschwarzRad ,
The minimum license for Panorama is 25 devices. So, you have enough. You can confirm under Panorama > Licenses.
Yes, do not assign them when you add the devices. https://docs.paloaltonetworks.com/panorama/9-1/panorama-admin/manage-firewalls/add-a-firewall-as-a-managed-device
The Panorama version must be greater or equal to the managed NGFWs. If the other 5 devices are not in Panorama, you will need to import their configurations. https://docs.paloaltonetworks.com/panorama/9-1/panorama-admin/manage-firewalls/transition-a-firewall-to-panorama-management/migrate-a-firewall-to-panorama-management
If you import the NGFWs to Panorama, there are 2 steps that are critical.
Export the device config bundle (step 5) before the 1st push. This step deletes the local policies and objects.
On the 1st push, select Force Template Values if you want to manage the Network and Device configuration from Panorama.
Thanks,
Tom
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