How do you group all cameras from different DVR to make a group

Dear Dahua engineer: do both the camera AND the NVR have to support the feature for it to work? Is there a webpage that, for each AI feature, lists all your cameras and NVR's that support it? (available in the US). Because the answers I'm getting is "not every Analytics + camera has every Analytics + feature" and "it depends". Additionally there's Analytics+, Premium IVS, Advanced IVS, WizSense, WizMind and it's not clear if any product with WizSense includes every feature from Analytics+, for example.

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