You can create as many as you need. Through groups you can make group audio and video calling.
In the left top corner there is an option Create Group.
Once you click on create a group it automatically shows members in the workspace or directly you can search names and also you can skip this add members, after creating group you can add members.
Then you can have multiple options like giving group name, add group icon and there is an option to make a group private or public.