In the Destination panel tab, you can create rectangles that are then available in the Viz Mosart UI for assigning sources to newsroom tag destinations, while the template is in preview or program.

• Press Add to add the selected target area.
  The target areas are displayed in the Viz Mosart UI as drop down boxes. They become clickable if a source or shortcut is selected by the user.
  

See also section Program Window in the Viz Mosart User Guide.