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Create room distribution list
To summarize rooms and workspaces into groups you have to create a distribution group from type -RoomList via Exchange PowerShell. Room lists are specially marked distribution groups that you can use the same way you use distribution groups.
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Exchange OnPremise and Exchange Online
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Use Exchange PowerShell to create a room list
This example creates a room list for building 32.
New-DistributionGroup -Name "Building 32 Conference Rooms" -OrganizationalUnit "contoso.com/rooms" -RoomList
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Use Exchange PowerShell to add a room to a room list
This example adds confroom3223 to the building 32 room list.
Add-DistributionGroupMember -Identity "Building 32 Conference Rooms" -Member confroom3223@contoso.com
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Use Exchange PowerShell to convert a distribution group to a room list
You may already have created distribution groups in the past that contain your conference rooms. You don't need to recreate them; we can convert them quickly into a room list.
This example converts the distribution group, building 34 conference rooms, to a room list.
Set-DistributionGroup -Identity "Building 34 Conference Rooms" -RoomList