Yes, you are able to create multiple whiteboards in a Samba Live session and switch between them.
You will want to click on the document switcher icon . You will find this icon on the top-left corner of any open document or whiteboard. Please note that this icon is only visible when a document or whiteboard is open.
Once you click on the icon, you'll see a list of all available whiteboards and documents shown as tiles. Click on the tile you wish to switch to and this whiteboard will now be displayed to your audience.