Multi-channel help

Hi, I have a Zmodo Greet and 2 Zmodo Wireless Security Cameras. Is it possible to have all 3 of them in a multi-channel group in the app? Currently, the Greet is showing as 1 device and the 2 cameras appear as a group. Do i have to remove all 3 devices an re-add them together to make them a group? (It would be nice to be able to create custom groups with registered devices.)