Working with Conference Rooms
A conference room is used to control access to conferences. You could create a conference room just for board meetings, then create a board members group and give the group access to the board meeting conference room.
When you created your conference center, the system created a default conference room called Public Conference Room.
To create another conference room, click on the Conference Rooms link, then click on Create a Conference Room.

Enter the name of the conference room and click the create button.

After Creating the conference room, click the group access link next to the conference room.

Then click "Give a Group Access". Select the group in the list and then choose what type of access they get.

For information on how to create a group, view the topic Working with Groups.